Kara Aisenbrey

I have a question about time frames for publisher edits. If they tend to give fairly short notice, I’m assuming they also have tight deadlines to meet. How fast do they expect freelancers to be able to complete their work? Because I’ve always been able to set my own schedule in which to be able to complete an edit, having 2 weeks for a CE and 3-4 weeks for a DE, for example, seems pretty normal to me (and some dev. editors I see regularly take 6 weeks).
Are those time frames reasonable to expect–or does it entirely depend on the job?