The steady drip of additions to JAB Holding Co's coffee empire is threatening to leave a bitter taste for traders who supply its growing network of roasters with beans, who say they now have little choice but to wait unusually long to get paid. After being purchased by JAB - the investment vehicle of the billionaire Reimann family - roasters ranging from U.S. specialty chain Peet's Coffee & Tea to European mass market conglomerate Jacobs Douwe Egberts increased their net financing terms to 120 days or more, up from an industry standard of 30 days or less, more than a dozen industry sources told Reuters.