Pharmacies: Least busy on Mondays at 9 a.m., most busy on Fridays at 3 p.m. Grocery stores: Least busy on Mondays at 8 a.m., most busy on Saturdays between 12 p.m. and 3 p.m. Restaurants: Least busy on Tuesdays at 3 p.m., most busy on Fridays at 6 p.m.