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It was too large for the ships Columbus took, provisioned as Columbus provisioned them. And everyone who ridiculed him knew that.

Magellan went out with a larger fleet and two years' provisions laid in.

2 years' provisions

Magellan Voyage took 3 years.

Hey may have left with 2 years' provisions, but as you said, he stopped at many islands along the way to restock his provisions.

Also it's a good thing he set out with the fleet he did, becaue only one of the ships, and a handful of the original crew, made it back.

Columbus' plan was equivalent to crossing the Atlantic and then the Pacific, with nothing in between.

That is a 24,000 km trip in a straight line (from Spain to the Moluccas, the Spice Islands) for which he was absolutely unprepared.

It's important to remember that the voyages weren't attempts to prove scientific theories, the Spanish wanted to establish new trade routes.