It will vary by both the type of shop, the location of the shops, and the shopper preforming the shops. I have done as little as 1 in a day to as many as 15.
That said today was 2 car shops, 2 bank shops, a usps, and a microsoft shop. Long day time to enter reports but I did have lunch and dinner out. I would also repeat the day.
Personally I think it is easier to do the same types of shops all in one day and another type the next if possible. However there are limits ex I won't do more than 3 dealerships in one day. Also make sure you use some sort of mapping service to pre plan your route and make sure it is feasible.
Shopping Western NY, Northeast and Central PA, and parts of Ohio and West Virginia. Have car will travel anywhere if the monies right.