Cap Feeder Lead Times specification should start with the real closure.
Lead time is affected by sample availability, design complexity, approval speed, control requirements and installation planning. The fastest projects usually start with complete cap information and clear photos of the downstream machine.
For a better buying decision, the useful comparison is not only hopper size or headline speed. It is how the feeder behaves with your closure, how the capper receives the cap and how easy the line is to run after changeover.
The safest specification route is to start with real closures, target output, line photos and the exact point where the cap must be presented. That avoids choosing a feeder on a generic speed figure that does not match the cap or capper.