How long is a reasonable amount of time given to prepare for a presentation-based interview?

I have just been invited to an email next Wednesday and I have been sent a task to prepare for. I have to create a ten minute long presentation based on a complicated set of reports they have sent me.

I have very little time to prepare for this: I am out of town on Monday and Tuesday for a different interview, and my time over Saturday and Sunday is limited (I have time -- but not a particularly large amount). Friday is now almost over.

Does anybody have any experience of this? I'm an entry-level employee.

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