Eleven miles each way on a bike. Is this a terrible idea?

I ride to work most days, about eleven miles each way, and I have been locked for a fortnight. So far I have only done short trips at the weekend and it was fine, but a short trip is not the same as doing it twice a day for a year.

The bits I am unsure about are the saddle pressure and what happens over an hour rather than fifteen minutes. I would rather ask before I find out on a Tuesday morning halfway to the office.

Anyone doing a real commute on a bike? What did you change?