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A dog's estrus (heat) cycle generally lasts for 21-23 days, but she may not be bleeding for the whole time.
There's a great site that explains things here: http://www.vcahospitals.com/main/pet-health-information/article/animal-health/estrus-cycles-in-dogs/5778
Since you generally see the bleeding in the first week, it's likely safe to assume that she's going to still be in heat for at least another week or so.
I hope this helps.