Time trial: Red Bull Ring Mazda RX-VISION '15

I am wondering what the small blue box with a "48" in it indicates. Sometimes they are a different color with different numbers. I see them all over, can anyone help with this. Just curious

Its an indicator when was the time last updated (6 is purple ,24 is green , 48 hours is blue ).

Ahh haaa, ok that makes sense. Thank you for clearing that up.