what does it make so difficult to cut the brains? Do you speak only about cutting or also about specimen-preparation before cutting and staining afterwards?
In clinical histology we do fast frozens. The tissue (15x15x5 mm) takes about 2-3 min to be frozen, the cutting is done for 2 sections in 1-2 min, then staining.... The average time from income of the specimen in the lab until ready report to the surgery is about 18-20 min.