I use various agentic dev tools all day long, mostly with Opus. The tools are very capable now, but when planning mid-complexity features, I find the time estimates hilarious.

Phase 1: 1-2 weeks

Phase 2: 1 week

Phase 3: 2 weeks

8 to 12 hours later, all the work is done and tested.

The funny part to me was that if I had an AI true believer boss, I would report those time estimates directly, and have a lot of time to do other stuff.