There are no absolute criteria to decide what a particular sound is in all phonetic environments.
⇒ Several factors influence
both vowels and consonants !!
Position of the word
e.g. The dog 161ms bit the man. 175ms
The man 155ms was bitten by the dog. 226ms
e.g. I like apples, oranges 94ms, and peaches.
I like apples, peaches, and oranges 174m