Convert DAX to M Script

Hi,

I need to convert the below Calculated column (in Dax) to custom column (In M Query). Kindly help.

Duration = 
var __currentCreator = 'Build routing'[Creator]
var __currentRouting = 'Build routing'[Unit Status]
var __currentDate = 'Build routing'[Date]
var __currentTime = 'Build routing'[End Time]
var __previousTime =
    MAXX(
        FILTER(
            'Build routing',
            'Build routing'[Creator] = __currentCreator
            && 'Build routing'[Date] = __currentDate
            && 'Build routing'[Unit Status] = __currentRouting
            && 'Build routing'[End Time] < __currentTime
        ),
        'Build routing'[End Time]
    )
var __timeDiff = DATEDIFF(__previousTime, __currentTime, SECOND)
var __Duration = IF(__timeDiff>360,BLANK(),__timeDiff)
return
    __Duration

Thanks in advance.