How long does it take you to get to and from uni? The journey there and back is just under 3 hours to me (ughhh public transport), so I'd rather have a massive day at uni if it means I get an extra day off.
Lectures etc normally finish 5mins early, and start 5mins late, so there is time inbetween to have a quick bite to eat/nap. If you bring food from home that day to snack on throughout, you should make it through. And even if your concentration span has vanished by your last lesson, you will have a whole day off to revise!!!
...BUT the positives of scattering classes over nunmerous days include sleepins and avoiding peak-hour.