I think the only limit is the size of the client's computer memory.
But I think that it is not a good idea to fill a DropDown with a lot of items. Because the webserver has to generate a lot of html code and send it to the client and your users would have to scroll trough all the items.
Maybe it's possible to split your data, or let your users enter the first character, and fill up your DropDown with only those items.
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