ohh.. ok, cuz i was thought its me only i used to fast tx like other coins i don't expect this long.
I actually have a missing withdrawal from Bittrex which I have logged a ticket to their support department. They usually answer quite quickly.
I made a couple of BOOM withdrawals, the first batch arrived quite quickly but the second batch haven't arrived at all yet.
I'm sure it's nothing to be concerned about. If you are worried, let Bittrex support know and they'll investigate for you.