Okay, i have'nt yet found out how to do this, so i thought if we try to find together. I think it would work with samekind of trinkets/things too.
I was solofarming in scholo, with Rune of The Dawn, and when i took the trinket off in end of the day, i still had the buff. That happened maybe 5 days ago, and i still have the buff wherever i go, or die.
I've been trying this with otherkind of spells, by logging out when i cast it etc... no success.