Yes, and here's how.
I started walking on the treadmill at 3% incline, 3 mph. A couple of times the Intensity Minutes meter (IMM) started flashing, but it wasn't a sustained flashing.
I raised the speed to 3.8 mph, at which point the IMM stayed flashing continually, which was at about 20 minutes (my pulse was around 102 at that point).
The meter was running. After the 30 minute mark, I started reducing the speed (I had earned 10 IMs). It continued earning IM minutes until the speed was down to 3 mph, at which point the IMM stopped flashing -- around minute 37.
Total walking: 37 minutes
Walking before IMM continuous flashing: 0 to 19 minutes (speed <3.8 mph)
Walking while IMM continuously flashing: 17 minutes (speed = 3.8 mph)
Total IMs: 17 minutes
(the point at which the IMs started counting -- getting cred for the previous 10 minutes where the meter had been continuously flashing)
Please check out my final post on IMs and the VHR in general: http://www.midpackgear.com/2016/01/vivosmart-hr-final-wrapup-and-some.html