the electrician who came to me with a broken Raspberry Pi said he got tired just from watching me working to fix it.

i feel a bit tired now too, and i was only doing it for 3 hours.

fixing computer problems takes pretty intense concentration. you have to fix the problem but you're not sure how, and on top of this, you have to take time usage into account. there is a lot to think about.

now imagine doing this a a full time job. personally, i found it too demanding.