Depends on the roundabout, actually. With a turbo roundabout[0] the lanes form a spiral rather than a circle, so you are automatically forced to the outside and doing multiple turns is physically impossible.

[0]: https://nl.wikipedia.org/wiki/Turborotonde#/media/Bestand:Tu...

One YouTuber did 24 hours in a roundabout.

https://www.youtube.com/watch?v=wqF8zLWo570

Even refueled while driving and got pulled over by police once. The police was basically just like "It's not illegal, but we got a report about you and wanted to make sure you're okay. You can keep doing it as long as you're not impeding traffic".

In fact it's illegal to take more than 3 rounds in Switzerland.

Famous scene in Chevy Chase's European Vacation.