I find that one or two hour timers help. I force myself to have a tea break or a snack. It lets you zoom out for a minute, and remember what you set to work on

I find that one or two hour timers help. I force myself to have a tea break or a snack. It lets you zoom out for a minute, and remember what you set to work on that day. This brings me to my next point: know what you're supposed to be working on. I like to write it down at the start of the day while I have breakfast, before I touch a computer.