That's strange, I've never heard of a 345 point Nvidia WU unless its new. They should be either 480, 384, 511 or 353 points. The F@H project chart does not list a 345pt WU for any client. Wish I could help more, but I use Fahspy not FahMon...
Edit/ Do you have a project # for that 345pt WU?...
Yes, you are right. 353 points. 90 minutes.