Hi Zoe,
Thanks for contacting Syncfusion support.
Your requirement can be achieved by creating the expressions as shown below.
ExpHours = Cast([Duration] as int) / 60
ExpMinutes = Cast([Duration] as int) % 60
Time = CONCAT([ExpHours], ' hours and ', [ExpMinutes], ' minutes')
Sample output in grid control.
We have also attached the demo video for creating these expressions.
Regards,
Anandaraj R