BitcoinQueue.com provides an easy overview of the current status of the Bitcoin payment queue.
The current limit is 1 MB of transactions per block. Ideal queue size for optimum
network speed (confirmations) is below the maximum for the next block. Transactions with
50 satoshi / byte or more have more chances to be prioritized, while transactions with fees
below 10 satoshi / byte are unlikely to be confirmed as long as higher priority transactions
are in the queue.
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