These took me about 90 minutes to get mounted, using a rotary tool cut-off wheel to do the trimming. The bolts that came in the package were completely useless though so expect a trip to the shop unless you keep some on hand. They work nicely for group rides and keep things clean.
This is my second set of these fenders! It does take a little bit longer to set these up, but they look and function great. They are easy to manipulate and cut, if necessary. They are also quieter than metal fenders.
I installed these on an All City Cosmic Stallion running 700x38 GravelKing tires. They look great and so far have kept me dry. Installation required one extra bracket to make the connection to the seat stay, but my local bike shop hooked me up.