Theoretically, if Elon Musk wanted to hedge/collar his Tesla stock how long would it take to set up the position?

For the example, let's ignore reporting requirements/selling restrictions. I'm just more interested in how long it would take to hedge a position of that size.

I'm assuming the hedge would be OTC with some financial institution being the counterparty and delta hedging their position.

What timeframe would be realistic for setting up such a large OTC options position?