The general rule of thumb, is 1 inch per hour and after it reaches the edge, 1/4 to 1/2 inch deep MP. Of course that is a little flexible, it doesn't have to be exact. For instance, in my 3 1/2 double wicked jars, if I get a good MP in 3-4 hours, I consider that a good burn. Usually a little bit of hangup on the side, will catch up on later burns. If it is just a tiny bit, I wouldn't risk wicking it higher just to catch such a small amount, it would probably overheat your jar.