Guys! The OP has already used Titebond II Premium wood glue, not drywall screws and not gorilla glue. Telling him to use a different method really doesn't help, unless he's planning a later expansion.
Drying time will really depend on how much air is able to get to your glue. Ordinarily, clamping / weighting for 2 hours is sufficient, but that's gluing wood together. Since only one side of your layout is wood, doubling the recommended clamping time is a good idea. The key instruction, though, isn't the clamping / weighting time, it's the DO NOT STRESS JOINT FOR 24 HRS one. So, you can take the weight off after 4-6 hours, but wait 48 hrs before stressing it (this would include leaning on it or applying plaster cloth or something over it). However, it won't hurt it to leave the weight on.
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