Confirmed after hour and more...thanks anyway!
Generally speaking a TX without a fee will take a little bit longer to confirm, but this is okay if you are not needing the money right away, or will not receive your product after "x" number of confirmations.
I am not entirely sure what "bittrex" is but it sounds like some kind of exchange. If, after sending a TX without a fee, you find yourself wanting to trade with the funds you had just spent, you can send a 2nd TX, with a fee (assuming that you have confirmed inputs while your other TX is unconfirmed) and that TX should confirm quickly assuming the TX fee is sufficient.