I started driving April 19th, and I've worked every single day that I've been scheduled since then. That said, I've worked 12.5 every single Saturday and I'd like to have at least one Saturday a month where I can do something in the evening. Nothing more and nothing less.
To answer your question...
Yes, you have the right to request two (in some locals 3) eight hour days per month. They have to allow 10% of the drivers relief from overtime.
If you are denied, check to see if 10% have an 8 hour day. Remember several may be given the day off to avoid management having to honor their 8 hour request. Those who take the day off should not be included in calculating the 10%. Demand your 8 hour day if 10% of the center did not get an 8. If denied wrongly file for 2 hours of penalty pay. And if your 8 hour request is not honored it does not count as one of the 2 (or 3) so ask for another.
If you stick to your guns they will be less likely to deny you in the future.
Or do like some wimps on this board and try to "fly under the radar" by never sticking up for yourself, living your life in fear and cowardice. You life, your choice.