Mark Breitbard came back to lead Gap in 2020.GapThe CEO of Gap's brand Mark Breitbard said he aims to make meetings more efficient by following 3 rules.Breitbard said it's important to question default meetings and keep the invite list tight.Executives at Meta and Snowflake have also spoken recently about trimming superfluous meetings.In an era of hyper-efficiency, leaders are taking a close look at the meetings on their calendars — and Gap's CE…