Go-to route includes a couple of 5-mile loops, one running north/south, the other about 5 miles away running west/east. So a round trip gets me 20-25 miles and a decent workout with lots of short, steep rollers and a few fairly flat segments, with around 1,500-2,000 feet elevation gain IIRC, depending on whether I add another 5 mile loop with a steeper, more continuous climb. Mostly access roads with little traffic.
Go-to bike seems to be my 1989 Centurion Ironman, with more than 10,000 miles since 2017. The other road bikes have about 2,000 miles each, and my favorite hybrid about 8,000+ miles. But I haven't ridden the Ironman much recently, as I'm tweaking a Diamondback Podium trying to get the fit and components to suit me. The Ironman is always comfortable so it doesn't need much work.