The maximum number of Ligature

I am going to work on a new project with about 6,000 ligatures.
I am wondering the maximum number of ligature to apply in a type of font.
Thank you in advance.

As many as OpenType allows, which is 65536 (though that means this font will lack base glyphs, so probably less than that). 6000 should be no problem.

To Tosche,

Have you any good resources to ligatures online what would be the most common.