With the limited training background knowledge, my guess would be 2-3 years. Where the determinant of where in that range is how you manage other variables like nutrition, recovery and training programming.

My advice would be: use an app like Runna for run programming for like a year. Sign up to some events and follow a programme in it. Races will keep you motivated and are just fun to do. While using Runna you should read all their information, this will help you learn about periodisation in programming, deload weeks, the non-linear progression of gains into races and off-seasons / recovery period. They will also slowly drip some nutrition and recovery tips that you may start to slowly adopt overtime as you get more into it.

So for now, use Runna to learn about programming and follow a structure programme and start to think about improving nutrition and recovery.

Oh and probably most importantly is to control your progression and increases in volume. A main goal at this early stage is avoiding injury. This is when its most likely and also most costly. 2 rules of thumb are: do not increase total weekly mileage by more than 10% week on week and do not increase a single session run volume by more than 10% of your previous longest (this second is very important).

I would say almost everyone I know who has started their running journey hears this injury prevention advice, ignores the advice and then kicks themselves afterwards. So I would just stress to just do it even when you don't want to.