Last few days it took a little big longer for transactions to performe, think that the network was a bit busy. But there is no unique rule on transactions time confirmation, it could be within half an hour or few hours, it could depend also on the fee you have used. Anyway, if the time takes to long you can always try with transaction accelerator.
He seemed to have traded a Bitcoin amount on July 30 or 2-3 days earlier. I think that, close to August 1, the Bitcoin split event will take place, so many people will withdraw Bitcoin on personal wallet so congestion will take place and long waits to be verified, even up to a day. Transaction fee is also a part. At present, transaction fees are quite high, if you let the transaction fee low, the transaction will take a lot of time, especially when trading a large amount of Bitcoin