This mapping falls apart when the individual devs have different levels of experience. A gold star is a different unit of time per individual; Dev A might be a

This mapping falls apart when the individual devs have different levels of experience. A gold star is a different unit of time per individual; Dev A might be able to complete 1 gold star in 1 week, but Dev B with less experience takes 2 weeks. The right thing to do isn't to estimate the average 1.5 weeks, since the case might not actually be done for another month, and it might end up actually being done by Dev C who just joined the team, for who 1 gold star is currently 3 or 4 weeks.