Determine how fast a touch is moving

I have a sample project attached which has on screen debug messages (Source\UE4test\MyCharacter.cpp) for touch events:
IE_Pressed(TouchPressed) in Red
IE_Repeat(TouchRepeat) in Green
IE_Released(TouchReleased) in Blue

I wish to know how fast the user is swiping so I call UWorld::GetTimeSeconds during TouchRepeat to get the time in between. However, I notice that sometimes I get same time value from UWorld::GetTimeSeconds between 2 TouchRepeat calls. Is this normal? Should I use some other time function instead of UWorld::GetTimeSeconds? Thank you.

Attached are 2 screen shots (UE4 editor and Android tablet). The debug message is in white when the time value is the same as the previous one.

[Sample project][3]