How does the Army work?

I was wondering how the army works. Is it like going to work for 7 hours and coming right back home to the family? My boyfriend is leaving in April for the military and I'm not quite sure how it all works. Will he be gone for long? Will he be able to stay home? I'm wondering because I don't want to be surprised when the time comes. I want to know straight up. If any of you girls know anything can you please let me know ☺️