Hi Shelly, nice to have you with us! I am Jo and I am 41yr old single mother to a 16yr old boy :) Started learning violin 4 and a half years ago...
that's fantastic that you are back to the violin :)
how long to practice? that is a very famous question all of us wonder about....
I think that if one is a 'total' beginner then any practice so long that is regular/daily then it will pay off and most importantly 'focused practice', so even ten minutes a day will pay dividends!
Of course later on as you get to the intermediate/advanced stages I'm afraid ten minutes a day will not suffice any longer....BUT once you get to the advanced stages you CAN carry on progressing with an hour a day if it is good/focused practice and if it is done daily and wisely. By the way, it does not have to be one hour all in one go, you can break it down in a couple of sessions if you need to or like to.
You have a GREAT advantage, you will have a teacher, many here on violinlab are self-taught and it can be harder when you are on your own, Beth is a great help though :) I do have a teacher and I have hourly weekly lessons they help a great deal, I would not have progressed as fast without a regular one to one teacher.
Go and read this article, it is VERY useful: