I find IH heat up times to be a moot point. No current vape allows back to back heat cycles in quick succession with a IH while having a single clue what temp your second cycle will be.The videos Brenyo have posted include heating the Tempest up via the Wand. Seemed like it took 30-45 seconds iirc but will hold the heat much longer so only one or two cycles is needed. To me it seems a wash overall for total heat time to clear a bowl but definitely just an opinion at this point!
I just picked up a wand the last couple of weeks for <$100 shipped on a deal posted in previous pages of this thread and love it so far. It's not the prettiest, but it's also not the ugliest and does a great job imo... time will ultimately tell how well it works for the Tempest.
So most people must be doing single heat extractions with these vapes (Anvil, Dani etc) at which point is 45 seconds a big deal? That's faster than any other vape on the planet to heat up and fully extract a bowl that size. My B0 needs 10 minute heat up. Then a 30-40s bowl pre heat. And even then it will require two hits with stirring in between. Don't get me started on portable session vapes.
At least with Tempest you could IH heat your first bowl, then rapidly reload, and quickly bring back up to temp with a torch using the visual indicator. That way you could chain hits back to back in absolute rapidity.