I am considering buying a Glacier Bay Roman Tub Faucet with Pullout shower, Model FR2P4000CP. Can you tell me how long the hose is when fully pulled out to maximum length?
How long is the spicket when hose is not pulled out?

We would have to do the same as you. Go to Home Depot and pull out the sprayer and measure it. Subtract the estimated distance from the valve to the holder (where it connects under the tub and then comes out of the holder). Not many plumbers have specifications on Glacier Bay, Pegasus or other big box store fixtures. There are differences even with the Moen, American Standard and Delta products that you will not find from wholesalers.