This largely depends on your current financial situation and your longer term goals.
I've seen DNs with one part time, one full time, two part times, and even a full time and a part time on the side.
It's all about your current skillset, your current financial situation, and how much time you want to work vs play.
Working Part-Time As A Digital Nomad
Depending where you're at, working one part-time job as a digital nomad is great if you have a modest budget and are just looking to break even. Or maybe part-time even means you're self-employed and limit the amount of jobs you take to ensure you only work 20 - 25 hours per week.
Working part-time as a digital nomad sometimes - but not always - means you're probably more focused on enjoying your travels than you are on your future career trajectory in the present moment. Which is ok - there's a time and place for both of those.
Working Full-Time As A Digital Nomad
Working full time as a digital nomad is for people who are usually thinking about their careers from a long-term perspective and want to balance exploring with work.
If you're planning to go full-time - it's important to set your expectations correctly. The whole, "digital nomads frolicking around the tropics drinking margaritas at 10am on a Tuesday while working" is an Instagram fairytale, and if you don't set your expectations correctly, you're going to be disapointed.