Angular 7 *ngFor Calculate & Display last 3 days time

Question

I would like to calculate and display last 3 days remaining time in a single p tag using angular 7

Here is my code

<p>You have remaining time <span *ngFor="let item of _objAttendancePage.Attendancelist">{{item.remainingTime}}</span> min to complete your working hour. Do you want to still punch out ?|</p>

After run this code output is like this:

You have remaining time 00:25:20,00:30:25,00:40:15 Min to complete your working hour. Do you want to still punch out ?

I expect if user logout his session before working hrs completed(last 3 days)

 

Employee Remaining Time List:

1st Day: 00:25:20,

2nd Dat: 00:30:25,

3rd Day: 00:40:15,

4th Day: 01:50:15 and so on

 

I Expect The Final Output Is: You have remaining time 96Min to complete your working hour. Do you want to still punch out ?