KYC compliance is something that has been written under their ToS and anyone signing up exchanges should do their proper studying to make sure that they have understood what platform is saying before they could go into such verification. If the exchange is a new exchange that I have never tried trading or do whatever, I do cave out my spare time to make sure I understood what exchange is saying about their kyc documentations, but for reputable exchanges that have proven to be the most trusted when I signed up I easily either pass through the kyc as soon as possible because sometimes those who signed up so quickly has that very best change to be verified so easily into their exchange to resumed their trading as quickly as possible.