My individual implants were not too bad. I can't imagine going through more than one at a time, although I know other people do it. Have no idea what the bone graft would add in terms of number of visits, time in the chair, and healing time.
I made sure my dd got regular checkups and took good care of her teeth. My parents couldn't afford regular dental care when I was young, and I happened to inherit the weak teeth in the family. Both of my parents had full sets of dentures by the time they were my age, so I feel fortunate to at least have teeth in my mouth even if many of them have artificial components.