You can take up to 14 days to do the circuit -- I would suggest taking as many days as you can -- it's a beautiful place and you'll likely like to stay at a few locations for a couple of nights.
I took my son and daughter to the Bowron's a few years ago and had a fabulous trip. Here's a link to our trip journal:
Cartop Kayak Carriers
Gedi Convertible Helmet
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