I have one there since August '18 and one since November, both still "months" away from return.
On the other hand, on another unit in January I reported a bad body and HL sent, upon my approval, a replacement (made from "not necessarily new parts") and I returned the old one. It took 2 weeks. This one is currently working but gets super hot back end AND near the air holes (not necessarily in concert). These flashes of heat happen so quickly I assume some kind of electrical short is happening.
When Hopper #4 failed and was sent in during June, I pleaded my case; multiple hopper owner with two people using them, down to our last, shakey one. I was given a +/- 30 day turnaround and sure enough, it's in the mail to me right now. Quite pleased about this, I'm glad my plea was heard, even as I know it slowed someone else down a little. (It seemed to me they could have bumped the 11 month old repair up the list instead of this one, but maybe they actually do look at purchase date, this recent quick turnaround is the 4th rma -- previous 3 were all back ends -- for this hopper in just under a year's time since purchase.)