Ever made fudge?
I've spread the gel like icing on some parchment paper to a uniform thickness. You can go thinner if you'd like smaller pieces. It took about 2-3 hours to set here, but trust your fingers- you might live in Canada. If it feels like you can cut it with a knife and the pieces hold their shape you're done.
If you're not lucky enough to live in Canada, you may want to put your gel in the freezer for about 20 minutes to help it set faster.