HuskyMan, your question is difficult to answer without knowing your technical skill, available tools and the time it will take a shop to rebuild the calipers (if required). If you have never bled brake lines before that step alone could take a while, plus we have no idea how many hours per day you will actually work on the brake job. Too many unknowns to give you a reasonable estimate.

It would be best to evaluate whether, or not, the calipers need to be rebuilt before you start the brake system overhaul so you can schedule that work with a shop. No sense rebuilding the calipers if they function properly and are not leaking. You should confirm that a shop will agree to use your caliper rebuild kits. As far as I know most shops simply buy rebuilt calipers and install them, rather than spending the time to rebuild calipers. Since you will likely be paying the shop by the hour, it may be less expensive for you to buy rebuilt calipers. Plus, a shop may not want the liability of rebuilding calipers for you.

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Fred Hoelzle