If we make a quick back of the envelope estimation: in the outlier case if those 3 million tokens are mostly output tokens and you always used an advanced model like GPT 4.1 which costs $8 per 1 million output tokens you would be close to hitting the limit that the plan provides ($24 out of $25 worth of tokens).
In pretty much most other scenario's (including a higher proportion of input vs output tokens and mixing in cheaper models) you could be a long way from hitting the limit. For example if you used half of those tokens on GPT 4.1 Mini instead of GPT 4.1 you'd only be roughly halfway to your limit ($14 out of 25$ worth of tokens).
