Is there a time limit for sending in photos after a modeling scout asks for them?

So I recently submitted some photos to ford models and they responded requesting more photos taken outside in natural light and with certain poses and attire. The only problem is that school work and daylight savings make this incredibly hard to do. It will take me at least 2-3 days before I have the time to respond, does this look bad? Will I be killing my chance before I even get it by not responding quickly? Also is it common for them to email back?

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