Short answer
Yes. A salt pool runs at roughly a tenth of seawater's salinity, and robotic cleaners are built to work in it. What salt is hard on is anything metal and anything left wet: swivel bearings, fasteners and battery charging contacts. Take the robot out between cycles, rinse it in fresh water now and then, and store it out of direct sun.
Salt chlorine generators typically run a pool at a few thousand parts per million of salt. Some makers state the salinity their robot is rated for — Beatbot, for one, rates the AquaSense 2 Ultra up to 5,000 ppm — and some state salt- and chlorine-tolerant motors, as Betta does for its skimmers. A rating is a promise the maker has tested for it; its absence is not proof of a problem, but it is one less thing covered.
Whether a robot can live in the pool is one of the most asked questions about them. Unless it is a docking model built to stay in, the case for taking it out after the cycle is simple: parked on the floor it is not cleaning, and it is sitting in chlorinated water with its seals under pressure. Robots that dock and charge in the pool, like WYBOT's S2 Solar, are designed to stay, and they are the exception rather than the rule.
Sun is the other half. UV hardens plastics and cables, and heat is hard on lithium batteries. A robot left on a hot deck through the summer ages faster than one stored in shade — which is also why a caddy with a cover earns its place.
Cordless floor+wall+waterline · 270 min, floor + walls
Cleans: Floor, walls, waterline, surface
Surface skimmer · 30 h skimming
Cleans: Surface
Cordless floor+wall+waterline · 150 min, floor only
Cleans: Floor, walls, waterline
There is no single number, because what ends a robot's life is usually one part: a pump motor seal, a power supply, a battery, or a cable that has twisted beyond use. Brushes and drive belts wear out on a schedule and are cheap to replace. The warranty is the only lifespan figure a maker commits to, and here it runs from one year to three; 4 robots publish no term at all.
Yes, provided the maker lists vinyl. A robot has no hard wheels dragging on the liner the way some suction cleaners do, and most use rubber, PVC or foam brushes that are soft on vinyl. The things that damage liners are grit trapped under a brush, robots climbing onto vinyl-covered steps, and wrinkles that a robot catches on — none of which is specific to one brand.
Every specification explained, with the numbers from the catalog behind each one.