Well, this has been fun......I've packed my bearings all my RV life and during the time I worked at my dad's RV shop. I think it takes about 45 minutes to an hour a hub to:
1. Jack it up and place safety stands
2. Remove wheel, hub, bearings and clean.
3. Grease and reassemble w/new seals
4. Adjust play and remove jack and stands.
I'd say it's a 1/2 day job. I've alwasy had a place to do this type work, so I can. Not everyone has this option so, to find someone you trust to do a good job that charges a c-note per wheel doesn't really seem that out of line.