I was supposed to work a normal shift which included doing little to no work just supervising the plant. I had 15 fire alarms go off and worked with the ER team to correct the problem and the employee required to relieve me didn’t show up for his shift so I took it over. The person that was supposed to relieve him was late for their shift. So over all I worked an 17 1/2 hour shift and came back in 4 hours later for scheduled shift