Classic saponification in grad school for me also included THF as a cosolvent. The mixture was:
1M KOH in H2O
MeOH
THF
in a 1:1:1 ratio by volume. Reactions rarely took longer than 2h. This solvent mixture handy because THF dissolves some organics that are insoluble in methanol, and THF itself is soluble/miscible in both water and MeOH. Not sure if this is applicable here as most cannabis extracts are very soluble in MeOH.