Add integer (minutes) to datetime

That was my first tought.

I tried doing this on dax but i couldn't get it to work properly

var tap = reportfusion[Tap to Tap]  (this is a measure. it sums a few columns)

//inicial
var iniciohora = HOUR(MAX(reportfusion[start date]))
var iniciominuto = MINUTE(MAX(reportfusion[start date]))
var iniciodia = INT(MAX(reportfusion[start date]))
var iniciosegundo = SECOND(MAX(reportfusion[start date]))

//duração
var duracaohora = INT(divide(tap,60))
var duracaominuto = int(reportfusion[Tap to Tap])
var duracaodia = INT(DIVIDE(tap,1440))

//final
var finaldia = convert(iniciodia+duracaodia,DATETIME)
var finalhora = mod(iniciohora+duracaohora,24)+int(divide(duracaominuto,60))
var finalminuto = mod(iniciominuto+duracaominuto,60)

//data final
var dia = DATE(YEAR(finaldia),MONTH(finaldia),day(finaldia))
var hora = IF(LEN(finalhora)=1,0&finalhora,finalhora)
var minuto = IF(LEN(finalminuto)=1,0&finalminuto,finalminuto)

var datafinal = dia&" "&hora&":"&minuto&":"&iniciosegundo
return
datafinal