Would it be possible to give each task a longer elapsed time/deadline?

Context:- tasks can take a long time to complete. Some of my PCs are switched off for a few days then used for a short time then switched off again for a few days.

I have tasks that expire (must be completed within) in 5 days.

If I switch off a PC for a day or so, switch on for say an hour then switch off again for another day or so then any work may be lost.

Can you give us, say 30 days maximum?