Hello. Cleaning Out A Garden Patch About 5 WEEKS Ago

Hello. Cleaning out a garden patch about 5 WEEKS ago l must have gotten into a NEST of chiggers. ( l suspect they are chiggers). There are tiny "bites" all over my torso. I'm a 69 y o female. I count approx. 60 bites. My question: how long will they last?? The itching gets intense and the best relief has been Chiggerex plus! Which is benzocaine.