I would treat DMAIC like an arc. Take a minute to start with the end and let the listener know what you accomplished. Where you started and where you finished. Then spend a minute defining the issue that was at stake if you didn’t do the project. Then spend 4 minutes on the big discoveries in either the process or the data. Spend another 3 minutes describing the solutions and how you overcame resistance or built acceptance. Then 1 minute on how you’re maintaining the gains and how all is stable. That ought to do it!