At the rate homes are going on the foreclosure block in Maryland these days, it would take 21 years — yes, years — before the current “pipeline” of homes in danger of foreclosure are all sold. That’s according to industry consultant LPS Applied Analytics, which shows a dramatic drop in the number of Maryland foreclosure sales (repossessions or other involuntary transfers) after the robo-signing revelations last fall. That’s pushed the state’s time-to-sell figure skyward to the fourth-highest nationwide.