In social science research (including communication), you really need the time to sit down, read, think, reflect, and write.

Social science research is all about justifications.

That's why many people advise others to do it full time rather than to do it part-time.

Part-time is doable but it will just drag your time.

In full-time PhD, you can spend your entire day reading, thinking, reflecting, and writing. Sometimes you could just spend an entire day just to write one single impactful sentence just to justify a point.

I tried part-time before and I decided to switch to full time. That's the best decision ever.

And if your career field doesn't appreciate a PhD qualification, then there's no point in doing it.

PhD is a qualification to train one to be an independent researcher.

Well, for those who want to do it for self-satisfaction, I believe you will change your opinion in a few months time. It will give you depression instead.