Recoat time will be dependent on the hardener used. Generally, you can tell if it is still wet by seeing if you can dent it with your fingernail. At 70 degrees with a normal curing hardener, it will likely be fully cured before 24 hours or near fully cured. If I am close on the time, I will generally wait until it dries fully and then scuff the surface with 100 grit or rougher sandpaper and coat over that.
The biggest mistake you can make with epoxy is not getting the ratio correct and also mixing too big of a batch. If you mix a large batch don't stir too long and immediately pour it into a large container so the resin is sitting shallow. If the mixed resin is sitting in a container more than say 3/4 inch deep it will start to exotherm/heat up really fast!
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