Cutting speeds with NEJE lasers

NEJE software uses Burn time in Milli Seconds how dose that relate to Burn/Cutting Time with Lightburn software

Are you referring to the time estimate in Preview? This is expressed in terms of HH:MM:SS (hours, minutes, seconds).

If you’re referring to cut speed settings that’s based on the setting configured for this, typically in mm/min, mm/s, or the equivalent in inches.