I've done LSA on day 1, double LSA on day 2, then on day 5 did 1.3 hits of decent LSD and didn't really break through.. just enhanced colours, some patterns, and emotional amplification.
Mushrooms I've always had to take double each consecutive dose. Waiting 1 week for either I'm back to 120%, a few days later 100%.
However, I've done PEAs (400/400 Mescaline, 15/20 2c-i, 15/26 2c-e, 23/25mg 2c-t-2) before, once a day, with no tolerance to the effects (mescaline was last).