Timer for Worm Queen

[Tango(SCRUB)]

Ok, So I tried to keep time of how long it took to kill the worm queen, but tbh I wish there was an In-Game Timer that told me how long I have been fighting the Boss for so I can try to aim for the Achievement, I would love if this could be a thing because trying to start a timer is hard when your trying to start the fight at the same time and keeping track of it is hard too,

*If you choose No,Please give a reason so I could understand, Thanks