How many hoses can one smart timer control?

Single-valve units (Rachio Smart Hose Timer, Orbit B-hyve Gen 2, LinkTap G2S, Meross single-zone) cover one spigot, though Rachio and LinkTap let you add more valves to the same hub. For multiple hoses on one spigot, Orbit's B-hyve XD comes in 2-port and 4-port variants and Meross sells a 2-zone version. If you need more than four outlets, an in-ground-style controller like Rachio's 16-zone unit is a different category.