I can't update iOS 14 for a long time

hello dear Apple developers! I have tried many times to update my IOS, but I couldn't do it. I press the button "download and install" after which "update requested" is displayed and on top "counting the remaining time" I waited a very long time for this time to be calculated, but there is no progress! I have enough memory to update IOS 14! what is the problem, I cannot understand. I read on the forums that you yourself approve of this update, and that you have to wait a bit, because many people want to update the iPhone. please tell me how long should I wait for this "update requested"? Yours, Kirill.