Usually I let my jars freeze precip for at least 24 hrs, but it sounds like you may not have drained off all of the solvent efficiently. I recommend pouring off the solvent from the jar without taking the crystals with if possible. Scrape out the crystals and throw them onto a pyrex slab. After you get most of the crystals onto the slab, use a razor to thin out and separate the crystals so that they have maximum surface space for evaporation. If you still don't get crystals, you should just put the pyrex dish into the freezer. Once you get crystals again you can decide whether you want to heptane recrystallize.
Hope this helps! Remain strong, you'll get product successfully very soon.
(Note: I have never used shellite as a solvent personally)