Counting your fasting time

When do you start counting your fast? After the last bite of the last meal? Or wait a while before you start counting?
 
This is a good question because it directly affects the fasting period. However, my plan is to do OMAD with a 4-hour window to make it a bit comfortable for me. That means I can eat leisurely on the last hour of the window period. If my window is 8 am to 1 pm then I can start eating at 12 noon so I wouldn’t be in a hurry to finish my only meal of the day.
 
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