Even celebrity trials rarely take more than a few days. The case drags on for months, but the jury is only selected and seated for the very end. Such cases are extraordinarily rare.
The overwhelming majority of the time, jury duty means calling in the evenings to determine if you are needed the following day. Most of the time, the answer is "no".
The flip side of your right to a trial by a jury of your peers is a duty to judge as a peer of the defendant. It is extraordinarily selfish to deliberately avoid jury duty.