How to display telemetry in Nextion Binding Editor

Hi.

I make F3 type DIY steering.

I set the telemetry Diff Time for the iRacing Dallara F3 steering display to GameRawData.Telemetry.LapDeltaToSessionOptimalLap in the Nextion Binding Editor.
However, it cannot be displayed like the game screen.
Game screen: After 60 seconds, it returns to 0 seconds.
Telemetry data: Even after 60 seconds, it will pass in decimal numbers.

Please tell me a good way.

Thank you.