There are many time tracking apps and what not, but for me personally i find it very helpful to just set a timer and a small goal.
Its kinda like the pomodoro technique. I’ll ussually use 25min timers, and go: “i will do these 3 points of revisions in the next 25 minutes”.
I also do the same thing for breaks. I’ll set myself 12 minutes to check out forums or what not. And setting a timer helps there. Or do some cleaning around the house for 25 minutes.
So why am i writing this? Well there is this website called e.ggtimer.com, the handy thing about it, is you can set the timer with a url, so i have these handy timers in my bookmark bar on my brower.
Hope you find this useful!