I moved some BTC over 3.5 hours ago and it still doesn't have 1 confirmation.
What is the longest I should wait?
Which fee rate you used for your unconfirmed transactions?What is the longest I should wait?
Bitcoin rose and fell a lot past days and people used high fee rates for their transactions. Yours will be stucked in the list of unconfirmed transactions in the mempool if you used very low fee rate.
Yours might be dropped from mempool after 14 days.
Did you mark your transaction as RBF, Replace-by-Fee? If you marked it as RBF, you can Bump your fee. If you did not mark it, you can use Child Pay for Parent.