I have a K5iis and a K1. I was out night shooting almost 2 years ago now with a friend who has a K70. The K70 was his first dslr moving up from a smart phone. He had read the manual 3 times and played around with the camera quite a bit. Anyway, we were out shooting and talking about something or other. We were in "B"ulb mode (and astro was not enabled) and he dials in 3 minutes - I was jaw dropping astonished. Went over to my K1 and did the same thing. Wow, was I very pleasantly surprised.
Nothing about it in the K1 manual, but it's in the K70 manual (and I'm guessing the KP also) [page 51, note 4 at the bottom of the table]. Must have been added to the K1 in a software update, which was very nice. I would suspect that it will also show up in the K3iii, too.
The ability to go beyond 30 seconds in Bulb has been something that I have wanted for a long time. You can just dial it up to a 20 minute exposure. I've used it a lot at 3, 4, 5 and 6 minutes. It's just really really nice to have it automagically built in - just drop dead stupid simple and easy.