Agree the samples, approvals and installation schedule.
Lead time depends on sample availability, design complexity, approval steps, controls and installation planning. Provide cap samples and downstream-machine photos early, and agree the approval route and installation window before committing to a schedule.
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.