What size yard can a robotic mower actually handle?

Capacity ranges roughly 0.2 acre (Eufy E15) up to 2 acres (Husqvarna 440iQ). But specialist-subreddit threads warn that rated capacity assumes ideal conditions; real-world coverage drops with slopes, tree cover that weakens RTK, and complex multi-zone yards. For anything over half an acre, reviewers generally point toward Husqvarna's iQ line or the Mammotion LUBA 3 AWD.