I applied for a TR Visa in April of this year and provided the Agoda email reservation and it was accepted still. I also only booked two weeks out of my 60 days and I only reserved it and didn’t pay fully and still was accepted.
He should’ve gone way before it has expired. Not sure why people wait till the last days to extend. It doesn’t matter when you extend, it doesn’t lessen the days you get, the extension gets added from the date your original visa was to end so you lose no days.
Airlines may or may not ask for proof of onward or return ticket and can deny you boarding if you can’t provide proof. Best to have a onward rent ticket on hand ready or book a cheap refundable flight to a neighboring country and then cancel it after showing the airline.
I was approved two weeks after submitting. I am not quite sure why they state for “whole period of stay”, I’ve heard from other people they only showed proof for a certain number of days of their stay same as well and they were approved.