Extra time refers to the additional time allotted for a particular task or activity. It can be synonymous with several expressions, including overtime, extended time, supplementary period, and added duration. Overtime suggests the time spent beyond the usual working hours, especially in cases of unpaid labor. Extended time implies a lengthened period beyond its expected duration, while supplementary period denotes an extra time added to a particular event. Added duration suggests the incremental extension of a time limit. In all of these synonymous expressions, extra time provides an additional opportunity to complete a task or fulfill a particular obligation.