The time is going to vary from person to person.. Just don't over do the development of your fingertip calluses. Muscle memory and dexterity also need to improve.. practice makes perfect, but don't forget to get a few breaks here and there..
Set yourself a practice routine..
For example
1 Tune up first and do warm ups exercises
2 Do you lesson
3 Take a break.. shake out your hands
4 Try a song in your ability range.
5 Go back to present lesson.
6 wipe down your strings
Make it your own. just stay loose and look through the Guitar Tricks web site..
Enjoy the trip..