Probably close to a year depending on event prices. Since you used Hidan as an example, he's around 16k usually. If you have no frags it would take you about 10 months. This also depends on which events he's in. For example, I believe this is the first time we've seen him in a while and he's pretty much in a ingot only event aside from daily points. All depends

metas shift consistently over there. Currently the popular ninja is reanimated Hiruzen. As for the strength of Edo Deidera, he is relatively strong. Price wise, not sure but should run around 16k at the most. He'll be good on the U.S. Side for a good while until the ninja pool expands more.