This depends on how much of the starting product was made up of terpenes to begin with and whether or not your starting product was thoroughly dewaxed.
With waxes in your product, as you preciptate thca from the solution the percentage of waxes in the solution will increase. In this instance you will end up with a consistency close to budder if you allow your solvent to totally evaporate.
I dont usually have this problem, my terp fraction usually gets to a point after crystallization where its so runny that it becomes pretty easy for me to separate crystals by just allowing them to settle as best they can to the bottom of the container and decanting as much of the terp fraction as possible. Theres always some terp left with my crystals so I follow this up by dissolving the THCa rich fraction back into heptane and recrystallize.