Can you guess the time from which I haven't watched a movie?

[Dharminder Singh]

Which of the following sentence is grammatically correct?

A. Can you guess the time from which I haven't watched a movie?

B. Can you guess the time since I haven't watched a movie?

 

[tedmc]

It is not clear what you mean by "time". Do you mean when you last watched a movie or how long since you last watched a movie?
If it's the latter, you can say "Can you guess how long it is since I last watched a movie?"

 

[Dharminder Singh]

It is not clear what you mean by "time". Do you mean when you last watched a movie or how long since you last watched a movie?
If it's the latter, you can say "Can you guess how long it is since I last watched a movie?"

By "time" I meant how long since I last watched a movie, for example, 1 year, 2 year, etc.

Now please tell me, are the sentences A, B correct or incorrect?

 

[Piscean]

Neither is correct. tedmc's suggestion is correct and natural.