500 years, and you launched just a couple of crafts.. i know you hate as much as me sending a probe far far away, then waste years waiting for that window or encounter.
My idea is the next: add a calendary. For example, i want to add an autoburn for send a satellite to cylero wich will be in 6 game months, but then i end flight. So you can check the calendar or set a recordatory before that happens so you don't lose entire years in a single flight waiting. During your wait time, you can make other stuff like send probes to moon or just orbit another satellite around droo.
This feature is thinked for being purely optional, so if you don't have problem with a urados and return mission with a duration of Like 14 years then you don't need this feature, but personally i would like to don't waste so ingame time for realism purposes.