I have just realised that my time on the computer is being monitored

Thor generally sits by my feet at the computer desk, but every so often he comes up, pushes his nose onto my knee, and THEN pushes my right arm away from the keyboard !!!
After I registered this behaviour, I timed it - and yes - he allows me about 15 mins before he decides ENOUGH! :D :D
Now, my query is this: do I allow myself to be "trained" like this, and acknowledge that I do spend way too much time on here - or do I exert "Alpha dog" position and ignore his training :D :D :D ?
Margot