Pretty important detail after all, and it would be easy to retrace such info with the phone of Kris' boyfriend at hand, which I am sure they did in those frantic first hours and days after finding out that their daughters were missing in Panama. I get the impression that Roelie knows exactly what she is talking about when she corrects Hans on the time. I think we can rely on them having done their homework beforehand and being certain when that last contact time was. The families were prepared for this very important first TV interview.
Roelie, Kris' mother, says that that last contact with Kris was on the day she went missing, Tuesday April 1st, at 14:00 PM local time.
