Claim: The longest-reigning in the list of premiers of Alberta by time in office was Ernest Manning with seven mandates counting 25 years and 195 days in office, followed by Peter Lougheed with four mandates serving 14 years and 52 days.
Evidence: 1 Ernest Manning 25 years, 195 days 7 2 Peter Lougheed 4 14 years, 52 days