Dovo straights don't come from the factory shave ready. Unless the vendor has arranged to have the razor honed (which very few do), it will not be shave ready. Send it off and get it honed. You will then know that it is ready to use. Have a look at someone in the UK like Neil Miller. How often does it need to be honed? How long is a piece of string. Too many variables to give an answer. How good is your stropping? Do you use paste? How thick is your beard etc etc etc.