I knocked out Mining IV in the time before this test. Sadly I haven't gone deep into any other skills so the rest are 1.5 days at the most. Picked Teleportation III since the 3rd point will be nice Glitch is open again.
Wish I had know it would be this long a wait. I'd have chosen a skill that was going to take longer than about 2 days. :( But I need the one I started - badly! So I'll live with it.