This sets how often the modem takes a statistics sample, from disabled up to every 90 minutes in 10-minute increments. Because each sample becomes a row in the stored statistics table (capped at 255 entries per cdm570StatisticIndex), a shorter interval fills that table and rolls over older history faster, while disabled(0) stops logging Eb/No and Tx-power trend data entirely. Setting this to mins30(3) would log a new snapshot every 30 minutes, giving roughly 5 days of history before the 255-entry table wraps.