I think there certainly are cases where the more experienced one will finish 100x faster!<p>In actual numbers, that means that anything that takes the senior dev, say, 3 hours, must not take the junior developer more than 7.5 weeks.<p>Junior devs are really, really bad at certain categories of task, and can totally blow that budget of two months.<p>Sure, the 100x speed difference might not exist when writing a binary search for a sorted array. However, being able to throw up a small shell pipeline or something instead of trying to write a bespoke program is where the difference starts to come out.