Can you answer a technical question about science lab equipment?

I have seen in science labs a magnetic machine that spins a capsule in a beaker to mix things. One puts the beaker on the machine, drops in a polarized magnetic capsule, and it spins.

How fast could a magnet spin in this way without some unwelcome result? I’m thinking actual revolutions per minute. I’m guessing that there may be a magnetic force, to centripetal force equation to use.

Thanks!