This is far from standard. Plenty of parents pay for OOT living expenses, semicha programs, airfare, and more post shlichus.
For 1 year. Not usually for more.
Starting age 20, there's shlichus year - where he works - in learning - and learns in a high school. Paid for by the high school.
Then semicha year - the price varies by program.
Then 770 or other job/learning setup the bochur arranges.