meh, for the most part, most fermentations will be complete at 10 days. That is granted that you pitched enough healthy yeast. bry-97 is basically us-05 which is basically wlp001, which is basically wyeast 1056 (or whatever order you prefer of comparing those). Danstar claims it can be finished in 4 days because of very vigorous fermentation.
Now as a new brewer it's always good practice to measure the gravity. Wait two days. Then measure again. If they're the same you know you've likely reached FG for most yeast strains. Once you start getting the hang of things (I'm not talking like after your fifth brew, but more like your 25th brew), then you'll have started to understand how the fermentation process goes. You'll also have started to get more aspects of the fermentation process under control... hopefully. At that point you will pretty much know when your fermentation is complete with most of your brews, and taking only 1 FG reading won't likely do you in.
I still like to know my abv, so I always take FG readings. It's also a way for me to check on my mashing processes (if it came out as predicted, too high, meaning I mashed too high, or too low, meaning I mashed too low.), but also a way for me to see how my yeast are performing (which is especially good to know the more generations into harvesting I get).
Either way, I would say, for now, check your gravity readings twice, two days apart, before you bottle it.
