The max term of H1b is 6 years. You can stay on H1b beyond 6 years either by being on the green card backlog queue (after passing a certain stage you can renew your H1b beyond 6 years), or maybe leave US and come back again (likely requires another H1b lottery?). What I'm saying is sure stay in the US for 10 years on H1b is possible, but it's also quite hard.
