Show with the longest preview period on Broadway?

Apologies if there is a previous thread on this, but I wasn't able to find one through the native search function or through google.

What show has had the longest preview period on Broadway? I would expect Spiderman, clocking in at 182 previews, but I can't seem to find any official confirmation of it as the longest preview period.

Not the longest but Merlin with Doug Henning (and Chita Rivera and Nathan Lane) started previews early in Dec 1983. The show was supposed to open three weeks later but kept postponing for a week. Finally the New York Times reviewed the show at the end of January saying that since audiences were paying full price and there was no set date to open, they had a right to let the audience know what it was like. They also said if the show changed before opening , they would re-review it. They panned the show. The show eventually opened late in February. The Times I think just ran their original review - but I can't remember.

Someone in a Tree2 said: "So with LET MY PEOPLE COME, what you’re saying is that they never officially let their people come?"

I was one who did.

And had a nice interaction with one of the cast members at the stage door.

Dear World had close to 2 months of previews and would have continued longer, but critics threatened to review the show anyway, and they were forced into an opening night.