Originally Posted by OregonBound
Without knowing how old you are, elementary school could have been last year or 50 years ago. If you are not conditioned to riding and to sitting on a saddle, 20+km each way is likely to be brutal. Not impossible, but certainly not fun.
I'd strongly suggest you start out with rides more in the 10-15KM total, range for a week or two until your bum conforms to the seat. You don't want to get to work and realize you just can't face the thought of riding home.
Paul
Sorry, I'm 26.
These are really good suggestions. I would have made my first long comute to work without realising if I could do it comfortably or not. Thanks.