|
btw. BTC blocktimes are 10 minutes
so at worst, even if you paid a really high transaction fee, you would need to wait up to 10 minutes to get your transaction "confirmed" into a block
exchange sites even require several confirmations (adding ~10 minutes per confirmation)
some vendors may choose to allow 0-conf transaction (meaning you don't to wait for a confirmation, if it's in the mempool waiting to get into a block, you are fine)
but that is almost replaced with RBF (Replace-by-fee) which allows to send a tranction again with more fees attached, making 0-conf unreliable
|