I'm with moshi on that one....[I'm usually with moshi on lots of things - kindred LS-spirit]....
Longest that I have ever had LiteSTEP up and running - just over 13 days.
Longest I have ever had a computer up and running? - just over 13 days.
That included a lot of shell changing, theme changing, recycling, step coding, theme creating, installing, uninstalling, you name it.
Did LS cause the stop after 13 days? No, I simply needed to turn the thing off to swap out a drive-caddy....
LiteSTEP 'can' be as stable as you want it to be [or let it]..