I have found that comfort
I have found that comfort levels vary among artists . I usually try to plan my firings overnight, so I am home when the kiln is running. I know a person who says she has left on vacation with her kiln still firing. (I would never do this.) If I am running errands I’ll leave for a few hours, but for the most part, I try to be home when the kiln is on. Some people have their kilns on an IP-enabled camera so they can keep an eye on it when not around.
Many kiln-controllers have an automatic shut-off if the kiln temperature rises a certain threshold above the programmed temp. You might want to consider that when purchasing your next kiln.
Fused Glass Designs
dba Jester’s Baubles