Your simplest approach would be to right-click the Web Sessions list's column headers and choose Customize Columns...
from the menu.
From the Collection
dropdown, choose the Session Timers
option and then select the timer of interest in the Timer Name
dropdown.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…