If you play in good casino you don`t lose your money but lose your time. It is bad, but it is better than losing your money in unknown cheating casino.
I don't understand what you mean by losing time if one play in good casino because definitely time is required to play in casino and I don't consider such time as being lost because it is invested in something worthwhile. What I understand as losing time is when someone engages in activities that does not bring back anything meaningful and casino does not qualify as that because people do win massively.
I mean that you spend some time for KYC but as the result you`ll get your money. You can lose several days, waiting KYC and your money. Most times i KYCed in 1-2 days, but there were several situations when it took about a week.
For me though, I've never had to submit my kyc documents for verification on any platform and had to wait up to a week, by any platform, i mean gambling casinos actually, but talk about crypto exchanges, the exchanges platform where it got them that much time (over a week actually) to get my account verified after I've submitted kyc documents they requested fo, was XT.com exchange, yeah, and I did not actually make a big deal of it since beforehand, I understood that they are one of the shitty exchanges around.
Coming back to passing kyc verification on gambling casinos, I would say that majorly all good casinos processes their customers kyc verification request within a day or maximum of 3 days if late, any casino that takes longer than this to verify their users kyc information is shitty to me.
So far I have one verified gambling account only which is my Stake's account, it was not a long process since my account was verified within few hours only.
Of course the speed of the verification process will be depending on some factors, the most crucial one is the human resources on the platform who are in charge to do the verification process.
The more staffs (both in number and experience) who is handling it = the faster verification process IMO.
I have not done other KYC in other casinos so I have no idea about average speed, but I have to agree that such verification process should not be done in more than 3 working days.