To remove the screen time of a slot in outlook, follow these steps:
Click on Outlook icon on the taskbar. In Outlook toolbar, on the Home tab, click Junk Email Links. Under Links heading, select the desired email address or contact group. On the right hand side, under Screen Time section, you will see different slots for which you can remove screen time. On the respective slot for which you want to remove the timer, Click on Remove button next to Screen Time value. This will remove the timer for that particular slot. Save your changes and check if it helps in terms of saving your time. If not, please consult your IT professional.