is it true...

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I think I read it on a post here.
Is it true that it takes over a week to see any movement on the scale? I've been doing Insanity for about a week now. I try to follow to nutrition guide with it or at least eat well and within my calories. I haven't seen a single ounce of movement on the scale. Its not entirely discouraging because my stomach is looking flatter. I do not have a measuring tape because I'm moving and its packed up currently. It'd be nice to see at least .1 off the scale lol.