In the manual is the only max 30 min permitted operation at a stretch, as the unit will become too hot.
What can be expected at such affordable device but as I think / was.
Profigeräte costs now being expected not without reason a few hundred euros more.
All in all, suitable for use for private / hobby.
Bin therefore only once satisfied.
I was, however, so far only one hour off, I can say for long-term use still nothing ...