This is what I did:For theaccrual periodselect "every hour on paycheck"in the Hours accrued per hour paid type in ".03333" (if you take .0333 x 30 hrs worked=1h...
I set our sick time up to accrue .0333 hrs of sick time for every hour worked. Maximum hrs to acrue is 48 per year. with a maximum to carry over of 80hrs.