How would I know? As little as you want it to be or (at least legally) as much as your visa allows.
You mean how would you know how long until you get there? They have little TV's on the front (or back) of seats and that may tell you. Or just watch for announcements from pilot crew
My suggestion is that you may kindly check your passport for EMBARKATION SEAL with Date {Date of Emigration /entry in the Passport. Count number of days from there, till today. Hope this will be helpful you , Thanks to all who replied.
Can you be more specific
I don't get your question
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