I've played BaseWars in Tachyon, where we had an 18 hour straight match... literally.
Mind you other than me, it wasn't the same people mostly. Some would leave, others would come in
and then the opponent team would gain strength, they'd loose some people, our side would go back up.
That's resource collecting, fighting off enemy pilots, staging base attacks, etc.
Yes it is fun, but it is very tiring.
If the idea is to have a always ongoing battle, you might be better suited to having something like
a mission where you're already well into a battle that already started before you arrived in system.