if(ac.Arrived_in_Site__c != null && ac.Raised_Date_Time__c != null && ac.Visit_Priority__c!=null  && ac.Arrived_in_Site__c > ac.Raised_Date_Time__c){

        businessMillisecondsDiff = decimal.valueOf((ac.Arrived_in_Site__c.getTime() - ac.Raised_Date_Time__c.getTime()));
        businessMinsDiff = businessMillisecondsDiff / (1000*60);
        businessHoursDifferen = businessMillisecondsDiff / (1000.0*60.0*60.0);
        minDiff = businessHoursDifferen.setScale(2);//(2, RoundingMode.HALF_UP);
        system.debug('-----before corrected hours:'+minDiff );
        hour =integer.Valueof(minDiff);
        //hour = Math.Mod(integer.Valueof(minDiff),60);
        system.debug('-----hour :'+hour);
        minute = Math.Mod(integer.Valueof(businessMinsDiff), 60);
        system.debug('-----minute :'+minute);
        raisedhours= hour+'.'+minute;
        system.debug('-----corrected hours:'+raisedhours);
}
System.debug('=====Outside For Loop=====');

if(raisedhours!=null && tvalue!=null){
  if(decimal.valueOf(raisedhours) > tvalue){
         differenthours=true;
  }else{
         differenthours=False;
  }
}

Oppid = [SELECT Name,Raised_Date_Time__c,Arrived_in_Site__c,Visit_Priority__c,Reactive_Sheet__c,Maintenance_Sheet__c
                   FROM Opportunity WHERE Raised_Date_Time__c!=Null AND Visit_Priority__c !=Null AND Arrived_in_Site__c!=Null Limit 1];

  apexPages.CurrentPage().getParameters().put('id',String.valueOf(Oppid.id));
  ApexPages.StandardController sc = new ApexPages.StandardController(Oppid);
  VisitRaisedDateTime controller= New VisitRaisedDateTime(sc);
  controller.OppList= Oppid;
  List<Opportunity> op=controller.getRaisedDateandTime();
  }
}