Are you the only company offering solutions? If so you can probably get away with it, but if not then it's not just 20 minutes it's 20m * n companies. 20 minute

Are you the only company offering solutions? If so you can probably get away with it, but if not then it's not just 20 minutes it's 20m * n companies. 20 minutes is generous too, if your website is vague and your sales guys are clueless then it's much more than 20 minutes. If even one of the competitors has a sticker price and publicly available documentation then I'd be evaluating them closely before even considering you.