Keep Mac awake automatically

Hi,

My Mac is set to sleep after 3 minutes of inactivity. Is there an AUTOMATIC way to make the Mac stay awake for example, 3 hours without using System Settings and then return to every 3 minutes?

Perhaps a script or app that would run in the background when certain websites are active to keep it from sleeping ??

I would enable such a script/app when using various websites that are live or video where the mac sleeps after 3 minutes, sometimes 6 minutes.

Interesting that this does not happen with Firefox, only Safari Ventura. Doesn't happen with Big Sur or iPhone either.

But, would rather use Safari Ventura.

Thanks