How long does it take for a bittrex BTC deposit to show? It has been a few hours and I did a test BTC transaction and I see it in pending deposits.
Well sometimes it just lags and the pending transactions just don't show up at all until they actually get the required 2 confirmations, at which point they just appear in your wallet balance immediately, skipping the pending confirmation bit.
It's a common bug, usually it should update within 1 minute of depositing your BTC but it can definitely take much longer as i said.
Anyways, thankfully it's only a test transaction. But in the future just don't freak out - as long as you sent to the right address you should receive it in yoru balance eventually.