Daily Stand-up
This is the most important part of the day, and it doesn't take more than 15 minutes. The idea behind these meetings is not to control what every team member does but to talk about the progress they've made each day and the obstacles they're facing. It's the best opportunity to talk about joint ventures and cut misunderstandings at the root.
Scrum masters may follow more than one team within a company, so they'll attend multiple daily meetings every morning.