How strong are eddy current brakes?
Experiment:

Neodymium magnet disc: 30mm dia, 5mm thick, about 40 grams

Aluminum Bar: 920mm long, 40mm wide, 3mm thick

Leaning against a wall, 80mm space at bottom

Time to slide from top to floor: about 4 seconds (stopwatch, but old operator)

Note that there is no air gap, so some friction.