How often should I defragment drives formatted as NTFS?

How often should I defragment drives formatted as NTFS? I've heard claims from some people that you don't need to defragment hard drives formatted as NTFS (perhaps even from Microsoft at one time), while others say it needs considerably less defragmenting than FAT.
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bert [Entry]

"Personally, I still find that defragging a drive every few months helps keep everything moving quickly. It's not as dramatic an improvement as it used to be, but it still seems to help.

I'm more curious whether SSD drives will make defragging unnecessary, since the penalty for random reads is so much lower than with HDDs."