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Zero seconds (I bought it broken hoping that it was a straightforward repair).
In reality they are a cheap grinder. Taking it apart showed that it's really quite basic, which isn't necessarily a bad thing but it does seem that motor failure isn't too uncommon. Which is a shame as usually there is a way to have sacrificial components that fail before the motor and thus prevent a costly repair. On the flip side it is a lot more repairable than many other consumer electronics at the same price level.
I’m kicking myself, really wasn’t too complicated to take apart and test the motor. Och well!
I’ve also realised that in reality I want something that’s a bit easier to adjust grind size and I don’t mind spending a bit more. And I learned a load about troubleshooting electronics in the process!