Sorry just checking back! I check email more promptly (every day) than I do the forum, so feel free to write me directly at [email protected].
WXSIM can run forecasts whenever you want, and up to every hour in auto run mode, though I personally just have it doing five forecasts a day.
The time resolution is just minutes regarding native calculations like solar radiation (a function of sun angle), response to precipitation onset, etc., but it’s about 3 hours regarding weather changes (wind shifts, most cloud cover changes, etc.) becasue that’s the resolution of the GFS data which it imports and largely relies upon for those variables.
Tom