Rome5

The steps look correct, but exactly where are you/did you run the commands from? Hopefully you're doing it from a live CD so that partition being converted is not active or 'mounted'. That's a key step and could cause the process to take longer, but more importantly, could cause errors or data loss on the partition.

Have you already completed the conversion? I guess I'm a bit confused, are you just asking how to speed it up for the next time?