Hawker 900 pilot reported the outer portion of their windshield cracked. They flew at a reduced speed and continued to their destination.

Narrative

While performing a normal descent through 18000 ft we heard a loud pop and immediately noticed the right hand glass portion of the windscreen had shattered on the outside. We were indicating around 310 knots so immediately starting slowing the aircraft down to avoid more damage. While slowing the airplane we monitored the pressurization and saw no abnormalities. We both decided 160 knots would be a good speed to maintain and continue on to ZZZ as originally planned. I informed ATC that we needed to fly at a slower than normal speed on the way into ZZZ due to a crack in the windshield and that we did not need any further assistance at the time. Once we were comfortable that the windshield did it's job and stayed intact; I updated the passengers of the situation and that everything was okay knowing that they heard the pop and could see the windscreeen from there seats. We continued on to ZZZ at a slower than normal speed and made a normal approach and landing. We suspect the windscreen unexpectedly failed to operate normally cracking the glass. I believe we did the correct thing by slowing the aircraft down and just monitoring the pressurization and damage considering there is no checklist written for this type of situation.