Tell us how you did so.
Did you use the Cloud plugin by Didier Bur?
Cloud v8.obxx … SketchUp Plugin by Didier Bur (updated by TIG)
If you use the Cloud plugin by Didier Bur, you’ll notice the option to Triangulate Points.
In my experience, four hours seems rather long.
Again, tell us how you imported the points cloud.
IIRC, this model took about 45 minutes to import points and triangulate.
Import and triangulation via the Cloud plugin by Didier Bur.