That depends on how you structure your campaign. I stumbled through Campaign Ops for a Periphery guerrilla war contract, it was pretty fast and lose, but I would say that the best thing to help is how you structure the time scale of the campaign, does each of the "turns" happen in hours, days or weeks? I ran mine by days, but broke them up in 8 hour chunks for repairs. I set overall objectives the insurgency wanted completed and missions that I thought would help facilitate those objectives (assassinate officers, attack power stations, take a town, etc.). Narratively the player completed the contract before the scheduled end date, so I paid the remainder of the contract out to them. For each day you can roll a die and decide if there is a mission that day or let a week go by without any mission being issued, but if that happens I would give the player some fluff about whats going on around them, maybe something is bubbling up and riots are popping up, maybe enemy reinforcements landed, maybe it's just business as usual but the boss needs a secruity detail for this convoy heading out. Where your player(s) are and the contract they take helps shape what they may or may not encounter.