I am not very mechanically gifted and the first side took me around 40 minutes and I was deliberately slow not to do any damage. The second was about 20-30 minutes since I was taking my time again. It took a while poking the hole since I didn't have a good tool. The liner is sturdy but still, I didn't want to tear it.I need to do mine, too.
It looks like one of those "three hours to do the first, thirty minutes to do the second" tasks.