Add: I think the breaking up of the 12 weeks into chunks is a good practice so you can measure progress, and have discussions about removing bits if you blow u

Add: I think the breaking up of the 12 weeks into chunks is a good practice so you can measure progress, and have discussions about removing bits if you blow up on time. However if 1 dev is doing this work they can do it on their own rhythm - maybe releasing 3 things in one week and nothing for 3 weeks. There is no need to synchronize with the team.