Its pretty useless to just give you boot times of random boards. There's a lot that affects boot times such as boot priority, settings and features enabled, etc..
I play with a lot of hardware, by that I mean any motherboard, cpu, video cards, etc. that gets released to the market, it usually goes through me and I can say that if its not a server board, it usually doesn't take long to boot up.
If its anything, you should be more concerned with whether the board is complete acpi compliant and the response time of your hard drive, not the boot time of a mb