ok apparently it takes almost 2 hours!! oy. i won't delete this thread in case somebody searches for this same question in the future 
true... this was more of a reply to the on screen message that says it may take "up to an hour". Um, yea, more like, at least an hour...TonyTheTiger said:Actually, it can take several hours to complete a C&D. Just because yours took about two hours doesn't mean that the next person's won't take three or four or more to complete.
Just a heads up for someone who's been waiting three hours and is starting to panic!
Wow! over 30 hours?! Yikes...Geeks4Rent said:My SIR S4120R ran "clearing and Deleteing..." for 30+ hours. DIrect TV and Samsung both told me it's toast. But Being a Computer geek; I just can't accept that. It's a harddrive and a Motherboard. therefore it's fixable. But I'm sort of clueless where to start; as I've never looked into hacking it.