> standup actually were 5 minutes like it should be according to theory

Jeff Sutherland who invented scrum thinks it should be 15 minutes, so according to theory they should be 15 minutes:

> The Daily Scrum is a 15-minute time-boxed event for the Development Team. The Daily Scrum is held every day of the Sprint. At it, the Development Team plans work for the next 24 hours. This optimizes team collaboration and performance by inspecting the work since the last Daily Scrum and forecasting upcoming Sprint work. The Daily Scrum is held at the same time and place each day to reduce complexity

https://www.scrumguides.org/docs/scrumguide/v2017/2017-Scrum...