I know on sugar cubes it doesn't stay for too long. I don't know about paper, though.
I had a few cubes left over from a trip, and we let them sit wrapped up in a tissue on a shelf.
A few weeks later, we took the remaining cubes.
We looked at them, and you could see where you dropped the liquid because it had turned weird colors (like purplish and bluish).
They seemed weaker than the last.
I took one with 7 hits, and it felt equal to/less than when I took 4 hits.
You'll have such a good time! So fun.
Oh, I've read on erowid that some people have taken mushrooms and lsd at the same time, and they had a very long trip (like 2-3 days or something).
I don't know if that's true, but it made me nervous to try it.