It is doable!
Up until COVID-19 times, I did a 34-mile round trip commute once or twice a week. The route is totally flat (it is Florida) and about a third of the distance is on a nice shaded path along a small river. I did not ride during the worst heat of the day, but I did have to contend with the afternoon thundershowers during the summer, which made getting home more interesting some days. I changed things up sometimes by driving part way and taking the trail almost the whole distance, 12-miles each way. This ride was easier, but it actually took more time overall to drive, park, and bike. A couple of years ago I did the 34-mile round trip three or four times a week. The rides got me into shape and seriously helped my mental health.
COVID-19 has changed things up for me. I now average rides of about 15 miles a day about six days a week.