You should practice as much as you can and want to, regularly.
We have busy lives, but if you practice even for 15 or 30 minutes four or five times a week,
you will gradually gain a great deal of skill and confidence with your instrument.
With more practice time your comfort and ability will increase more rapidly.
Everybody’s life is different – the important thing is, practice as much as you comfortably can –
and not over the course of a day or of a week, but for months! A year of regular quarter-hour
sessions will make you a better guitarist than a week of two hour sessions.
With regular focused practice, over time your success is certain.