To be honest, everyone is different.
Last year I rolled two days in a row; took 2 the first day and 3 the second.
To be honest, everything was fine with me. I rolled a little bit harder the second day than I did the first, but it was a little bit shorter of a roll.
The following day (day 3) wasn't as bad as everyone I had asked had me believing; no comedown, perfect afterglow. And by day 4 I was back to normal.
However after researching it a bit before I did this (I always research before I take or do something "new") I find that the following things can happen:
1. You may not roll the second day.
2. You may end up rolling, but it won't be as good or as long.
3. You will roll slightly harder, but it won't last as long.
It seemed that out of everyone who was asked, it was about 3 to 1 that you would roll the second day and that half of the people rolled harder while the other half didn't roll as hard (50/50 chances). I lucked out and wound up in the better group (rolled harder than the first day), but again this was how it affected me personally. You honestly won't know how you'll react until you do it yourself.
But make sure that before you do anything you understand the pros and cons, the risks that may happen, and are fully comfortable with your decision. Don't let anyone force you into something you aren't ready, and always be prepared for the worst (and remember your 5-htp!!!)!
Have fun next weekend, and make sure to hydrate yourself due to the prime daylight hours of operation this year!