They didn't always have a choice
Cassy looked at her new cauldron and since she had no problem making 5 level 3 magic pills at the same time, she started directly by trying to make 3 level 4 healing magic pills at the same time.
She was confident in her abilities and this cauldron provided her with an inexhaustible source of spiritual energy without the need to draw it in, so all should go well.
After preparing all the magic herbs on the table next to her cauldron that she needed to make the 100 level 4 healing magic pills, Cassy wasted no time and immediately began to make them.
After making her first 15 level 4 magic pills, Cassy was sure that she could make them 5 at a time like she did with the level 3 magic pills and so she picked up the pace again.
She was filling her jars with magic pills at an alarming rate compared to other Mages at the same level as hers, but she still needed 15 minutes now to create 5 level 4 magic pills and so it would take her 5 hours to make 100 magic pills from now on.