Stuck at 20 minutes a day: how to maximize speaking output?

I have a super demanding job and only have about twenty minutes of downtime per day to study Thai. I've been using Chickytutor.com to get immediate feedback on my sentence structure, but I'm worried I'm not getting enough 'real' conversational flow. Given my limited time, should I spend those 20 minutes on vocab drills or should I force myself into a script-based conversation simulation every single day to keep my tongue moving?