In my opinion it's the opposite of a liability. You're getting practical experience to know what it'll be like to work at that place. More hours ends up being better because each hour you put in gives you more information. It's an opportunity to see how things are run, get to know the team (if you pair'd with a few different people), get a feel for what you'll be doing, etc..

If you're worried about a 2 week commitment how are you not worried about general W2 employment where it's expected you'll be committing 40 hours a week until you either retire or die? The same applies for most 1099 contracts too where chances are you'll be putting in multiple weeks or months to complete a task.