to tell you the truth, if you really want to enjoy the instumentand get better, do not get hung up in practice time. Just play guitar whenever, or play until your fingers get raw.
If you a routine, you gonna one day get tired and feel obligated to play and that will take the fun out of everthing.

So basically, this is no race to see who can get better the fastest. Just play whenever you feel like it and stop when your tired.

Dont even consider actually formally practicing unless you want to learn a song, just play and fool around with riffs and solos until your technique and prasing get better.