I'm 53 and still only play pretty good, but if I knew then what I know now......
spend 1/2 an hour on tech stuff like scales, reading and learning the sheet music. That's the most you can do without wandering and loosing focus. Spend the next hour (or more) playing along with music you like. Then, if you're still fresh, go back to the scales and tech stuff. This is a hobby, so it has to stay fun!
RHW