About a minute and a half. It varies by 2~ seconds at most. Could possibly be related to how Linux does the calibrate_delay() stuff? (And well, I'm also not too sure on how deterministic it's supposed to be in terms of time).
Oh yeah, well that may be. Once I got X working in Slack, I did boot into that, but then again, back then I didn't know how to recompile my kernel and the machine did this interesting loop where it would try a few different drivers until it got to the one that worked with my matsushita CD drive.