So 15 minutes is a bunch, but it's also not so much.
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I've seen that much metal come out of a fresh rebuild after break in oil change.
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This!!! Unless you have a clean room and a Nascar level machine shop, "new rebuilt" engines shed metal. You've primed the engine so there was oil on the bearings. You didn't drive the engine or load the crank so there was minimal pressure on the rods. The engine has low compression and you don't run crazy amounts of timing so there's even more chance of low damage.
If the oil pump can generate oil pressure that's a huge plus. If you primed the engine at one point and noted the oil pressure then you can make a comparison. Minimal change means minimal damage. By all means perform a visual inspection on cam and lifters, on piston skirts and cylinder walls. You may find the engine survives without replacing bunches of parts.
Stories of mistakes? Who isn't human here. First engine rebuild was a 327 and I'd spent every extra dollar I had to buy new parts and to have the crank polished and the heads done. This was a huge step for me... much more than the usual "bolt junk parts together" technique I normally followed. I'd borrowed tools to hone the cylinders myself and I prepped the block at home since I was out of dollars. I cleaned all the oil journals with gun cleaning brushes, cleaned all the tin work, and really just put a ton of effort into prep. In the process of moving the block around on the floor I cracked the pan seal retaining ridge off the rear main cap. So I grabbed a cap from another engine. A cap's a cap, right?
Well I managed to get a few weeks worth of driving before the knocking started. If I'd stopped there I could have taken the engine back apart and would have found the damaged bearing. But I assumed the noise was something else and kept going. Eventually the banging got so bad I couldn't ignore it. By then anyone I knew with engine experience had told me the noise was coming from the engine. When I disassembled the engine I had metal everywhere. The oil looked like metal flake paint. The cam was wiped, the bearings were wiped, and I was out of $$. What a learning experience.
Then there was the oil change at my first dealership job. Right before lunch the service writer asked if I'd do him a favor and do a quick oil change on a CJ7 with a smallblock swap. The engine had been purchased through the dealership and the owner wanted to make sure we serviced it. "And as soon as you're done I'll bring it up front. The customer's waiting." I was working hourly in used car reconditioning. I didn't have to hustle and I wasn't used to doing it. I drained the oil, replaced the filter, greased the chassis, and pulled the truck out. To make matters worse, I got totally distracted and forgot to shut it off! About 15 minutes later the service writer comes back in a frustrated huff to find out where the Jeep was. "OH! It's right out there! I'll bring it up front for you." I hopped in and noticed the oil pressure at zero and realized that I'd never added oil!!!! I grabbed service writer and told him what happened. He told me to add oil and check the oil pressure. "If it's 25 psi or more at idle it's fine." To my relief it had 30 psi. I don't know if they told the owner what happened, but the Jeep left under it's own power and AFAIK the engine was not replaced under warranty.