First off, I would set the strict max 30 minutes time limit for each and every meeting. If it’s not enough to solve something: do a follow up next day but ask everyone to prepare properly. Or just move the discussion to emails.

2nd: be an ass as a moderator. Cut all the small talk, chit chat, warm ups, derailing, or ad hoc brainstorming (usually performed by two people while the rest of the attendees are slowly dying inside).