These hours have been established to insure that a physician is present at the time of your injection as well as during your waiting period. Allergy Lab Hours. Monday: (afternoon only) / 1 pm-5 pm. Tuesday: 8 am-12:45 pm / 2 pm-5 pm. Wednesday 8:30 am -11:30 am / 1 pm-5 pm. Thursday: 8 am-11:30 am / 1 pm-5 pm..