Replace 'Length' with 'length'.

phsource/ph_afrikaans

   unstressed
   length 140
   IF nextPh(r/) THEN
-    Length 190
+    length 190
     FMT(vwl_af/r@)
   ENDIF
   FMT(vwl_af/@)
   ipa ə
   length 140
   IF nextPh(r/) THEN
-     Length 190
+     length 190
      FMT(vwl_af/r@)
   ENDIF
   FMT(vwl_af/I)

phsource/ph_english_sc

   ipa a:
   IfNextVowelAppend(r-)
   IF nextPh(r) THEN
-    Length 250
+    length 250
     FMT(vowelr/aa_r)
   ENDIF
   FMT(vowel/a_3)
     VowelStart(w/wi2)
   ENDIF
   IF nextPh(isVFricative) OR nextPh(isPause) THEN
-    Length 180
+    length 180
   ENDIF
   FMT(vowel/i_5)
 endphoneme
   ipa ʉː
   length 160
   IF nextPh(isVFricative) THEN
-    Length 200
+    length 200
   ENDIF
   IF nextPh(isPause) THEN
-    Length 200
+    length 200
     FMT(vowel/u#_4)
   ENDIF
   FMT(vowel/u#)

phsource/ph_french

     FMT(voc/v_) addWav(vocw/v)
   ENDIF
   IF thisPh(isWordStart) AND nextPhW(isLiquid) THEN
-    Length 70
+    length 70
   ELIF nextPhW(w/) OR nextPhW(#r) THEN
-    Length 60
+    length 60
   ENDIF
   FMT(voc/v) addWav(vocw/v, 60)
 endphoneme
 phoneme z2      // silent unless followed by vowel
   vcd alv frc sibilant
   IF nextPh(isVowel) OR nextPh(w/) OR nextPh(j) THEN
-    Length 70
+    length 70
     FMT(voc/z) addWav(ufric/s, 40)
   ELSE
     ChangePhoneme(NULL)

phsource/ph_german

   unstressed flag1
   length 160
   IF thisPh(isFinalVowel) THEN
-    Length 210
+    length 210
   ENDIF
   FMT(vowel/a#_3)   // in eSpeak 1.44, this used vowel/V_3 at end-of-word
 endphoneme

phsource/ph_irish

   unstressed
   length 110
   IF nextPh(i:) THEN
-    Length 80
+    length 80
     FMT(vwl_af/r@)
   ENDIF
   IF nextPh(I) THEN
-    Length 80
+    length 80
     FMT(vwl_af/r@)
   ENDIF
   IF nextPh(e:) THEN
-    Length 80
+    length 80
     FMT(vwl_af/r@)
   ENDIF
   IF prevPh(i:) THEN
-    Length 60
+    length 60
     FMT(vwl_af/r@)
   ENDIF
   

phsource/ph_italian

 
 phoneme l^
   import_phoneme base/l^
-  Length 130
+  length 130
 endphoneme
 
 phoneme ts
     FMT(voc/v_) addWav(vocw/v)
   ENDIF
   IF thisPh(isWordStart) AND nextPhW(isLiquid) THEN
-    Length 70
+    length 70
   ENDIF
   FMT(voc/v) addWav(vocw/v, 90)
 endphoneme

phsource/ph_lithuanian

 FMT(n^/_n^)
   ELIF nextPh(isNotVowel) THEN
 IF nextPhW(n^) THEN
-Length 75
+length 75
 ELIF prevPhW(n^) THEN
-Length 100
+length 100
 ENDIF
 FMT(n^/n^_)
   ENDIF

phsource/ph_romanian

     ChangePhoneme(;)
   ENDIF
   IF prevPh(l;) THEN
-    Length 60
+    length 60
     FMT(vwl_ro/li)
   ENDIF
   IF prevPh(m;) THEN

phsource/ph_russian

 	FMT(n^/_n^)
   ELIF nextPh(isNotVowel) THEN
 	IF nextPhW(n^) THEN
-	  Length 75
+	  length 75
 	ELIF prevPhW(n^) THEN
-	  Length 100
+	  length 100
 	ENDIF
 	FMT(n^/n^_)
   ENDIF
 phoneme I^      	// "silent i", palatilizes the preceding consonant
   vwl starttype #i endtype #i
   unstressed nonsyllabic
-  Length 70
+  length 70
   IF nextPh(isVowel) THEN
 	ChangePhoneme(;)
   ENDIF
 	ChangePhoneme(y)
   ENDIF
   vwl starttype #i endtype #i
-  Length 50
+  length 50
   FMT(vwl_ru/ii)
 endphoneme
 
 
 phoneme I#
   vwl starttype #i endtype #i
-  Length 80
+  length 80
   IF nextVowel(isMaxStress) THEN
 	ChangePhoneme(I)
   ENDIF
 
 phoneme y
   vwl starttype #i endtype #i
-  Length 100
+  length 100
   FMT(vwl_ru/i#)
 endphoneme
 
 
 phoneme I
   vwl starttype #i endtype #i
-  Length 80
+  length 80
 
   IF thisPh(isMaxStress) THEN
 	IF prevPhW(j) THEN
 
 phoneme I2
   vwl starttype #i endtype #i
-  Length 80
+  length 80
   IF thisPh(isMaxStress) THEN
 	ChangePhoneme(e)
   ENDIF
 
 phoneme I3
   vwl starttype #i endtype #i
-  Length 80
+  length 80
   IF thisPh(isMaxStress) THEN
 	IF prevPhW(j) THEN
 	  ChangePhoneme(e)
 
 phoneme E
   vwl  starttype #e  endtype #e
-  Length 100
+  length 100
   FMT(vwl_ru/e)
 endphoneme
 
 
 phoneme E#
   vwl  starttype #e  endtype #e
-  Length 100
+  length 100
   IF thisPh(isMaxStress) THEN
 	IF prevPhW(j) THEN
 	  ChangePhoneme(e)
 
 phoneme E2
   vwl  starttype #e  endtype #e
-  Length 80
+  length 80
   IF nextVowel(isMaxStress) THEN
 	IF prevPh(j) THEN
 	  ChangePhoneme(I3)
 
 phoneme E3
   vwl  starttype #e  endtype #e
-  Length 80
+  length 80
   IF nextVowel(isMaxStress) THEN
 	ChangePhoneme(I)
   ENDIF
 
 phoneme o
   vwl starttype #o endtype #o
-  Length 100
+  length 100
   ChangeIfNotStressed(V)
   FMT(vwl_ru/o)
 endphoneme
 
 phoneme O
   vwl starttype #o endtype #o
-  Length 80
+  length 80
   IF prevPhW(isPalatal) THEN
 	ChangePhoneme(8)
   ENDIF
 
 phoneme u
   vwl starttype #u endtype #u
-  Length 80
+  length 80
   FMT(vwl_ru/u)
 endphoneme
 
 phoneme u#
   vwl starttype #u endtype #u
-  Length 80
+  length 80
   FMT(vwl_ru/u#)
 endphoneme
 
 phoneme u"
   vwl starttype #u endtype #u
-  Length 150
+  length 150
   FMT(vwl_ru/u#u)
 endphoneme
 
 phoneme 8
   vwl starttype #o endtype #o
-  Length 100
+  length 100
   ChangeIfNotStressed(V)
   FMT(vwl_ru/8)
 endphoneme
 
 phoneme e
   vwl starttype #e endtype #e
-  Length 100
+  length 100
   IF prevPh(Z) THEN
 	ChangeIfNotStressed(y)
 	ChangePhoneme(E)
 
 phoneme ju
   vwl starttype #u endtype #u
-  Length 190
+  length 190
   FMT(vwl_ru/ju)
 endphoneme
 
 phoneme ja
   vwl  starttype #i endtype #a
   IF thisPh(isMaxStress) THEN
-	Length 200
+	length 200
 	FMT(vwl_ru/ja)
   ELSE
 	FMT(vdiph2/ii@)
 	ENDIF
   ENDIF
 
-//  Length 200
+//  length 200
 //  FMT(vwl_ru/ja)
 endphoneme
 
 phoneme V#
   vwl  starttype #a  endtype #@
   unstressed
-  Length 80
+  length 80
 //  IF nextVowel(isMaxStress) THEN
 	// not needed?   because V# is only used at end-of-word
 //	ChangePhoneme(I3)  
 phoneme Y // will not be used in future
   vwl  starttype #u  endtype #u
   unstressed
-  Length 140
+  length 140
   FMT(vowel/ii#)
 endphoneme
 
 
 phoneme A
   vwl  starttype #a  endtype #a
-  Length 100
+  length 100
   FMT(vwl_ru/a)
 endphoneme
 
 
 phoneme a
   vwl   starttype #a  endtype #a
-  Length 100
+  length 100
 
   IF prevPhW(j) THEN
   ELSE
 
 phoneme V
   vwl  starttype #a  endtype #@
-  Length 80
+  length 80
   unstressed
 
   IF nextVowel(isMaxStress) THEN
 
 phoneme a#
   vwl   starttype #a  endtype #a
-  Length 100
+  length 100
   FMT(vowel/a#_3)
 endphoneme
 

phsource/ph_zh_yue

   IfNextVowelAppend(;)
 
   IF nextPhW(k) OR nextPhW(N) THEN
-    Length 150
+    length 150
     FMT(vowel/ii)
   ENDIF
 

phsource/phonemes

     FMT(n^/_n^)
   ELIF nextPh(isNotVowel) THEN
     IF nextPhW(n^) THEN
-      Length 75
+      length 75
     ELIF prevPhW(n^) THEN
-      Length 100
+      length 100
     ENDIF
     FMT(n^/n^_)
   ENDIF
     FMT(voc/v_) addWav(vocw/v)
   ENDIF
   IF thisPh(isWordStart) AND nextPhW(isLiquid) THEN
-    Length 70
+    length 70
   ENDIF
   FMT(voc/v) addWav(vocw/v)
 endphoneme

src/libespeak-ng/compiledata.c

 
 	{ "PauseBefore", tINSTRN1, i_PAUSE_BEFORE },
 	{ "PauseAfter",  tINSTRN1, i_PAUSE_AFTER },
-	{ "Length",      tINSTRN1, i_SET_LENGTH }, // TODO (deprecated): use 'length' instead
 	{ "length",      tINSTRN1, i_SET_LENGTH },
 	{ "LongLength",  tINSTRN1, i_LONG_LENGTH },
 	{ "LengthAdd",   tINSTRN1, i_ADD_LENGTH },