How many years for avocado to fruit and what yield and income can I expect?

Grafted avocado typically starts bearing some fruit from around year 3 to 4, with yields rising as the tree matures over 6 to 8 years. A mature tree can give a good number of fruits, but per-tree and per-acre yields vary widely with variety, climate, pollination and management, so any single figure is unreliable. Income is very sensitive to price, which is currently good for quality fruit because much of India's avocado is still imported, but local prices can change as domestic production grows. Plan for several years of investment before meaningful returns. Get realistic yield and current price ranges for your variety from your KVK and from farmers already harvesting in Maharashtra, and verify market demand before scaling up.