I am starting to road bike to work and it will be 10 miles each way. The last time I rode a bike was 4 years ago, so I’d need to work up to it a bit. I’m 23, 5-11, around 210 lbs, trying to get closer to 185-190. First, how long would it take to work up to being able to ride 10 miles (sweat isn’t an issue because I can shower at work) and also, is 20 miles a day and then some on the weekend enough to get in good shape? Thanks guys.