# Choosing the periodicity in a SARIMA model

Given the order (P,D,Q,s) of a SARIMA model, s is an integer representing the number of periods in a season. Intuitively, I suppose it would be 12 for monthly data and 4 for quarterly data.

But if I have hourly data (for a whole year) and I'm using only a small number of days as training data (say 10 or 14), what is a proper choice for s?