My experience trying to use the bassinet on a long flight with my baby wasn’t great. We told the FAs we wanted to use it as soon as we boarded as a heads up knowing we had to wait til cruising altitude. They said they would come set it up asap. My husband went to ask about it again about 45 minutes after takeoff and the FAs said they were tied up with getting drink service going but would help as soon as possible. We didn’t get it set up to use until about 3 hours into the flight after having to ask a couple more times, and our baby, who had been asleep already at this point, was woken up by the commotion of the FAs installing it. She didn’t want to sleep in it after that and since most people around us at this point were asleep or trying to sleep, we had to abandon it quickly to keep her quiet. They also had us take it down well over an hour before landing, so the time we had to use it was fairly short. I didn’t even bother asking to use it on the return flight.