Other than getting the chlorine out - which takes more washing, not less - I just figure that they take the same care as other lycra-type garments, like running or cycling shorts or yoga outfits.

I always rinse mine immediately, usually by showering in it (including soaping as much of it as I can reach). Then not letting it sit around wet is important, too - since I always have to drive to the pool, I'll squeeze (not wring) out any excess water, then roll it in my towel to wick out as much water as possible (same as I'd do with any hand-washed garment), then put it where it can get the most air circulation possible until I get home, and hopefully out of direct sun. Since I have a hatchback, that's not a big deal, but if my car had a trunk, I'd still put it in the passenger compartment. Hanging it off one of the headrests lets it get some air circulation and also helps keep the sun off. Then hang it to dry in the laundry room - call it good if I'm going to use the pool again before the next load of laundry, machine wash (front loader, delicate cycle, hang dry) with all the rest of my workout gear with the next load, and always before putting it away for any period of time.

I don't really know how long they're supposed to last, but the only places mine wear are (1) between the butt-cheeks, which I'm pretty sure is just because I only use it for deep water running and not actual swimming, which puts extra stress there, and (2) if there's a shelf bra, eventually the elastic will get brittle, like elastic in every other garment I have.