Is there any limit to the number of PPA's I can add to the system? Why?

I came across a post which suggests:

Do Not instruct people to add PPAs unless it is necessary

And one of the reason it has mentioned:

There is a finite number of PPAs that a user can add.

Really?

Is there any limit to adding PPA's to the system? Why?

Also, on what factors do the limit depend?

Solution 1:

I'm not aware of a number limit, but I do know that as you add more PPAs, you get more twisted and twisted dependency chains and PPAs can/will begin to conflict with each other.

You should only add a PPA if you really need/want what's in it. I, for example, have the webupd8 PPA for ST and a couple of other things, X-Swat, and Kernel edgers.

If someone knows of a numerical hard limit, that would be good to know, but this is the reasoning on why I personally limit myself to a few PPAs.

Edit
Evidently there is a hard limit related to GPG keys, and it is being worked on.

Excerpt:
There is a neat way to squeeze couple of PPAs more through this keyhole of 40...
Look into /etc/apt/trusted.gpg.d and You might find some pairs or triples of same size. Check them with diff and if they are same You can leave only one...