Latest hashcat beta adds some help for that, new feature. You can add as many handshakes as you want (to make sure there's at least one valid) while cracking them all at once takes the same time as a single handshake.
So for all you WPA crackers out there, add as many handshakes of the same ESSID as you can to your hccap.
So for all you WPA crackers out there, add as many handshakes of the same ESSID as you can to your hccap.