I don't mind 10 seconds. 10 minutes gets my goat. 1 or 2 bikes can be passed pretty easily, even on a hilly, curvy road. A pack of 20-50 is a different story. Though slower, the herd is much longer than a car, and require a very long line of sight to get around. Then, after creeping along behind them for 10 minutes, we finally come to an intersection w/ a stop sign. They stay bunched up, filling the lane, and cross the intersection 2-5 at a time as they can. Another 5 minutes. At least now they are spaced out and I can pass them 3-4 at a time. Another 5 minutes to get past the whole herd.
There must be a number of cycling clubs here. The nearest road to us seems to be a favorite route for them to go from town to the lake.