We only use "rounds" in combat.
These "rounds" are only because an order issued is only received in intervals.
Everything else, is going to be in real time.
You order a force to go somewhere?
A round starts and takes 90 seconds.
During that round, upkeep is increased.
Personally, I think that a force should get orders for a prolonged time. Meaning that a player can.... here is an example:
A force is ordered to go to location A. The game returns an ETA. There it will guard a group of harvesters for a number of rounds. The number of rounds can be set by the player. 960 a day seems a nice round number.
And this number should be entered, right next to the order.
Maybe it is even better to have the player to simply enter a time.
Either way, the movement costs increased upkeep.
And the order for distracting any enemy from the harvesters, also costs increased upkeep.


Health of units is no longer included.
Might apply this later on in a different way.
***
Units have a SSS, Self Supply System. Or Self Supply Storage. Either way, this starts on 100%. And each day, 10% upkeep is removed.
Once it reaches 0%. Upkeep is then removed from a saturation. This goes 2.5 times faster. Or 25% a day. And thus is empty after 4 days.
We get a total of 2 weeks before everything is empty.
Once entirely empty, the unit dies. Regardless of health.
In order to get the sss back up, you need to resupply the unit with the help of a supply truck or supply centre.
In order to get the saturation back up, you will need some sss. And upkeep is automatically removed twice from it.
If an unit dies by upkeep. 20% of its value is used to restock the sss of the rest of the force.
***
Ways that health can have influence.
Health low? You need more upkeep.
Health low? When dying by upkeep, only a portion of its value is reused to restock the sss.
***
What remains now is determining the sss value for those 10 days. Once new. It should start at 100%.
Probably it is 100% of its value as well. This can be changed of course if someone requests different values.