Yes, they last the duration of the motion.
Note for Wyze Cam Outdoor:
Wyze Cam Outdoor allows for adjusting both the Recording Length and Recording Cooldown so that you can either record the full duration of motion or end the recording after a set amount of time (or add a gap between recordings) to help reduce the impact that this has on your Wyze Cam Outdoor's battery life. These can be changed under Wyze Cam Outdoor > Settings > Event Recording.
Backup to Base Station is unavailable when using Cam Plus with Wyze Cam Outdoor.