That’s one of those questions which can only be answered individually. Forward motion in a kayak is needed in order to even reach a mile. Just sitting in the kayak and floating with the river current (much like tubing) is fully dependent on how fast the current flows. A conditioned paddler can easily set a pace between 4 to 6 miles an hour, and keep up that pace for many hours. With that said, most starting will have an average paddle speed of about 2 miles an hour (on a small lake/pond with no winds).