The half-life of approximately 15 minutes for free neutrons is considered long. It's actually the longest for any sub-atomic particle if I recall correctly.
I think protons would like to have a word with you.
Proton decay has never been observed, afaik.
Edit: that's still the case. Since protons can not decay in the standard model, actually observing it would be huge.
Free protons (protons outside of an atom) have never been observed to decay. Protons inside a nucleus can of course decay, see: https://en.wikipedia.org/wiki/Positron_emission
If someone has the time to point to the research, the article would be massively improved by mentioning the typical lifetimes of each of the listed exotic atoms.
A "short lifetime" could be nanoseconds or could be years when you compare it to the traditional lifetime of the non-exotic version of the atom and knowing what is typical for each exotic atom would be good information to have at a glance.