While it is a desktop class SBC under certain environments, it will be different for everyone depending on ambient temps.
Do keep an eye on MCU temps if you are going to attempt anything beyond it's current task.
Thanks for the hint!
I installed lm-sensors via the packet manager
and then use 'watch -n 2 sensors' to keep an eye on the temperatures.
I also used 'sudo apt install psensor' - now I have a graph for both temp sensors (CPU and GPU)
I got the instructions from this page:
https://itsfoss.com/check-laptop-cpu-temperature-ubuntu/