I don't think it's normal. Most of the Dice Casinos offer you an account without KYC. Some others want KYC. Well, Then you should be fast in the verification.
There are too many Casinos on the market. And Players want the easiest way to play. Why they should wait 48 hours to get verified?
One thing to bear in mind, KYC is not mandatory means that players are able to play without KYC. So why it sounds like a big problem while you can play without waiting to get verified? KYC itself is an important thing, the process needs to be done manually to check the data as it is a sensitive case. It is better to have longer time for verification than instant verification by system.