If its just a single session, without too many parallel agents, fable on xhigh lasts an entire session without hiting linits.

Sadly since fable usually works comfortably for 10-20min at time without human input, i end up juggling at least 3 other agents and it lasts me about 2 hours.

If i have a really hard problem or big refactor, i use workflows. This consumes the entire session quota in about 45 minutes.