There's nothing wrong with doing a little favor -- call it 'cultivating healthy work relationships,' and do some of it on Monday. On Tuesday and Wednesday, if you can't muster persuasive facts and figures to support your strategy, saying straightforwardly that you need more time is smarter than trying to fake it. Plus, your extra research will lead to some elegant fine-tuning. Deals, legal issues and the like have hidden elements from Thursday through Saturday, so get a second opinion (and maybe a third). On Sunday, listen and learn.
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