wats d approach for developer job,,,?

Hi,

I am trying to create a formula field for the below requirement for which i need help on it


I have to convert milli seconds value given to the normal time value using a formula field


I tried the below formula its working fine for minutes and seconds , but not sure how to add hours to it

MY FORMULA :

IF((MOD((Duration_Number__c )/60,1)*60) > 10,
TEXT(FLOOR( (Duration_Number__c )/60)) + ":" + TEXT( FLOOR(MOD((Duration_Number__c )/60,1)*60) ),
TEXT(FLOOR( (Duration_Number__c )/60)) + ":0" + TEXT( FLOOR(MOD((Duration_Number__c )/60,1)*60) )
)

I tried to add hrs but getting incorrect number of parameters in if expected 3 recieved 4

Help me how to add hrs in my formula

Thanks in Advance