Relocation constraints?

So I've been contacted by a recruiter through my university about a possible job and they asked me, "Are you willing to relocate without any constraints? If you have location constraints, please briefly describe what those are."

  At this point I've never had to relocate for a job so I'm not sure what constraints I need to apply. It sounds like they want me to be able to relocate at the drop of a hat but I'm not sure I can suddenly relocate without finding a suitable place to stay and under what time constraints I should give for relocation.

How do I answer this?

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