Dynamic dropdown Warning: Don’t add too many entries

I am using a dynamic drop-down widget. On the settings it states:

Warning: Don’t add too many entries. If you have too many, your form might crash or stop working.

What is considered too many? Thanks!

Hi, thank you for contacting support.

The dynamic drop-down widget can hold up to a maximum of 65,000 characters.

I hope this information helps. Let us know if you have further questions.

this is super helpful -- thanks!