Family of four, no plumbing until December 2026. One porta potty enough?

Our bathroom renovation hit a major delay, and now we're looking at no plumbing until December 2026, over two months away. We're a family of four (two adults, two kids under 10) using a standard portable toilet on our driveway. It's on level gravel, and the rental company's vacuum truck can pull right up to it. We're home all day, no special events or alcohol, just daily living. I'm starting to wonder: is one unit enough for this duration? How often should we expect service visits? And if we need an upgrade, what's the step up from a standard unit that won't break the bank?