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Um, chary is 9-12 hr pop? (cant be bothered to check wiki sry lol)

So @ 9:00pm uk time (also cant be bothered to check what times that is in us .. sry again) i belive the window is open 9:00pm ~ 00:00am, i cant say im 100% on this as people always seem to differ on maintenance and NM timers, only thing i do know is in my past attempts at logging on for long spawn nms after maintenance its never failed.

Failing this just do a /search "Sea serpent grotto" 9/10 x's you can tell when hes due just by the people who are in the area, brds thfs nins normally a good sign.

Anyway best of luck^^