Never.

Why?

Because no 3rd party has done the necessary work to become a nationally viable party. No 3rd party will be viable until they start investing in candidates in local/state elections.

There is no cheat code to make a 3rd party candidate president. 3rd parties have to start winning local/state offices, then get representatives in the House, then the Senate, before even having the possibility of running a candidate that can win a presidential election.

Anyone voting 3rd party for president is extraordinarily ignorant and assisting in the decline of this nation on the fastest timeline possible.