Needs more info. How long have you been full time (not that it really matters); since you are the bottom FT driver you are a "cover driver," a permanent one, but one still the same. As bottom seniority, you get to take the route nobody wants. THE FOLLOWING INFORMATION ONLY PERTAINS TO SOUTHERN REGION SUPPLEMENT, DO NOT TAKE THIS ADVICE IF YOU ARE NOT COVERED UNDER THIS:
If you are a Full time driver, you need to come it at a full time driver start time unless instructed by management. Once you're there you get paid for 8 hours, unless you were told you needed to displace 2 people from 2 shifts. Now, if they lay you off more than 7 days, you need to be displacing a morning and and evening person, then you can claim your classification is a 22.3 inside/inside job so you only take a couple dollars hit. But the bottom line is, unless they tell you in advance 24 hours (or according to supplement) you can claim all time.