Why is it that some casinos take weeks and some take 24 hours using bitcoin?

To be honest i belive its beacuse some of them want you to keep laying with your winnings an other it has to do with the amount of volume that they have an also there local goverment regulations

Might depend on the casino policy 

If you mean withdrawal times - that may be due to casino policies as another member mentioned. If you mean deposit times - then it should not take longer than a couple of hours max.

Thanks for your question and involvement friends!

Many Casinos are still invoking the older T&C and\or KYC systems, sometimes taking 2-3 weeks for completing verification processing, then another 2-3 weeks to complete withdrawal processing.

Therefore, may we be mindful to become well aware of each Casino's relative policies before we become invested.

Peace Pleasure and Prosperity to You each! ❣️

Have Fun! 🪶🪶