I don't think it's going to take ten to fifteen years, if the current pace of breaking news is any indicator. Like how the feds tapped Cohen's phone and intercepted a call from Trump before they conducted that raid.
edit: Yikes, NBC got the story wrong. They didn't have a wiretap, but they did have a call log. I'm not sure why it's a huge deal that they intercepted a call from the White House, then. Of course Trump would want to talk to Cohen.