This is the worst experience I encounter and never go to Bitselr site now on because admin never bothers to help me out with this issue.
What's he supposed to do? Pay a pool to accelerate your transaction? 
What is the highest fee that you're willing to pay for a 'quick' transaction, by the way? For a recent withdrawal of mine, Stake used 150 sat/byte for a total of 0.0022 and it still took about 3 hours. It could just be the blockchain that was slow given this detail.
Then you will pay?
I already paid the maximum amount set by him and if the transaction didn't through who's the problem?
Just because he is paying you every week don't come and show your support. Before writing think logically.
I already paid a maximum fee then why should I need to wait so long? If there was an option to pay more fee than I would have done that but he didn't provide me with that option then whose mistake?
I'm talking about 60+ hours, not 3 hours.
Nobody's mistake. The obligation of Bitsler is to send your withdrawal according to your chosen fee. If you chose 0.0006, bitsler will send your transaction using an estimated priority fee. Once bitsler sent your withdrawal, the obligation ends there. It is now out of bitsler's hands. Bitsler does not control when your transaction will get confirmed. If you could provide a tx id, we could analyze it more and see what happened. I know its frustrating not to get your withdrawals confirmed asap, but before we blame anyone or bitsler for that matter, lets ask, is it bitsler's fault? did bitsler fulfilled their obligation to send my withdrawal using what ever fee i chosed? is bitsler liable for very long confirmation time? does the word "estimate" means "sure/certain"? or i am just frustrated and i can't blame bitcoin as a whole so i'll just blame bitsler?