my advice is after you finish the wall, and start coming down from the edible,
spark up a joint or a bowl and watch pink floyd / david gilmour “Pulse” live in 1994.
but yeah sonoma is right, start slow with a quarter dose. If this is the first time you have ever had edibles, that will probably do the trick. See how you feel in 45 minutes to an hour. I’d recommend not taking more than two quarters your first time. Unless you’re really determined to warp your perspective of space and time.
For some perspective, legal edibles are capped at 15 mg. in my state to prevent first time or low tolerance users from ending up in the emergency room due to disorientation.