On average for me (US delivery) it takes 4 to 6 weeks. I have ordered from them off and on since they were a California only store. I don't order if I need it "now". I had a grinder with a stripped gear and ordered it 2 months ahead of my trip to the US last year. It was there when I got there. This year, I did the same for a pressure switch to a air compressor. I dropped something heavy on the pressure switch of my air compressor and broke it. The HF AC switch was the similar and it was considerably less expensive for the same thing at Granger.
When ordering from HF for parts or other items, you have to plan them well in advance to be on the safe side.