Without good motivation it's very hard to practise regularly. : )
"Everything is hard, before it becomes easy".
It's no problem. Make break for one day.
Resolve yourself that you will practice for 5min per day. You will always find time for it : ). If you feel that you can train more, then practice longer from 15 to 30 minutes. The most important thing is to keep this minimum amount of time (5min)
Don't try to improve your reading speed to 1000 per minute at once. Determine yourself smaller goals. (e.g. Till end of the week rise speed for 1%)