How long can a nucleo f767zi boards work continuously?

Hello, I am using f767zi board which is getting power source 5v through a tablet, for how long can a nucleo f767zi boards will work continuously with out any interruption and with out causing heating problems.

Thank you

I would say indefinitely, I have one running continuous now for over two months.
I have not had to reset it at any time and has not locked up.
These MCU’s don’t burn power like Raspberry PI Broadcom CPU’s, so heat is not an issue.