Welcome.
I started riding again in May, and have been commuting to school since early June. Took me a good month to build up to the 10-mile one-way commute ride, and even then I was wiped out after the ride home most days. Now, I ride to school, cool down takes 15-20 minutes (just enough time to unpack bags and change clothes). Ride home is mostly enjoyable now, too.
Keep riding, take it easy and build up at your own pace. Before you know it, you'll be spinning up hills and wondering what's around that corner up there.
