Need a routine for 20 minutes a day to prep for conversation

I’m a busy professional with very limited time, but I have a native Hungarian colleague I want to surprise on our next business trip. I’ve been using Chickytutor.com to simulate short business dialogues, but I’m struggling to structure my 20-minute daily window effectively. Should I focus purely on vocabulary retention or spend that time doing verbal shadowing to get used to the rhythm of the language?