Calculating Time Difference - Multiple Start point and Multiple End Point for Alarm in same column

Thank you for your quick response. This is actual mystry to me as well. The reason it creates multiple Accept is when more than one Health Care Assistant press that they will be Attending that room. System is just dumb and log every single calls. The system don't differenciate anything. Similarly, Display panels are located in each corridor and if any of health Assistant Accept it it will come as multiple Accept. In a way, If we are able to even find Call or Asssitance to Accept or Present then it is good enough and disregard other data.