> Given the value they suggest I feel it's like one extra week of usage.

With how many resets they've been giving out lately, if you consistently max things out I would say this is a reasonable guess. You can ask your clanker via your favorite harness (the usage credits are equivalent to API pricing):

> Based on my session files and official OpenAI API pricing, check how much I would have spent in the past few months if I switched to the OpenAI API.