I held off on the waist hooping for a week and then just got straight back in to it. The only difference was that for a while i spent less time with the hoops on my waist, also i do have very light hoops so that may weigh in too.
I waited a week before I started hooping again and it didn't bother it however dropping a hoop on your industrial is another story. I would suggest not to hoop with pretty dangly barbells, they pull and the dangly part breaks off.
You should wait about a week for waist hooping, and after that just put a big bandaid over it (like one of those bigger heel bandaids, and if it starts to feel irritated, stop hooping around the waist. Shouldn't take more than a week or two for it to be ok enough with a bandaid. If it gets irritated, bad, remember sea salt soaks are the best for it.
I had my navel pierced just after I began hooping and it took a long time to completely heal. What helped a lot was that I found a wide butterfly belly ring that reached all the way across my navel and so the hoop rolled smoothly over it and the piercing did not get dragged or twisted anymore when the hoop rolled over it.
Now that it is completely healed, I never notice it at all anymore, no matter what kind of ring I have in it, and I spend a lot of time waist hooping.