Amnesia

Hoping to earn some extra cash, you have volunteered for an experimental drug trial. After taking the drug, you are told you will forget everything that has happened in the last hour unless you can locate the antidote. You're not quite sure why, but things start to feel familiar. You start to suspect it is not the first time you've done this. How long have you been here? Will this be the time you finally get to the end or are you doomed to repeat the cycle forever...?