This morning I logged in and looked in my inventory where I saw I still had 4 hours left on my 8hour experience pill. Then I went to LD and blasted some, and after 10 minutes I noticed that xp was going slower than before, so I looked in my inventory and I didn't see the experience pill anymore.
Kind of hard to believe I would be the first one who notices this. Maybe my mind plays tricks on me, but I am pretty sure that the experience pill disappeared before its time ran out.
I'll keep a close watch on my newly bought experience pill.
If anyone else thinks his/her experience pill disappeared before its time ran out, please reply.