Knees
I went for a 4 hour paddle with a friend a couple years ago. When we landed, I found my knee had seized and I literally couldn’t move it. My friend had to help slide me out of the kayak. Fortunately it never happened again.
Current and Wind
When paddling against current and wind it can be less energy total to paddle harder.
170 kms Non-stop
Here’s a great read for all you long distance armchair paddlers… like me 
http://www.canoeingdownunder.com.au/trips2.php
links
– Last Updated: May-29-11 4:30 PM EST –
WaterMark, I would love those links!
Don't worry, this would just be a one day thing.
Many Years Ago
Hal and I in solo rec canoes made it a habit of hitting off 15 to 25 mile days on a long trip. First few days was like trying to get out of a coffin in the morning but ya get used to it after a while. I think our top day was around 30 miles and we were hauling around 110 pds of gear each. Still get a s&^t eating grin on my face thinking about those days.
dougd
24 miles in 4 1/2 hours
Is what I did last fall at Raystown. Only made a couple pit stops, and once to fuel me up with food.
I paddled my Artisan Millenium, which has a very comfortable seat. I could have paddled further that day.
Thanks
Impressive
30 NANOMETERS?
I’d think that’d be completed rather quickly…
What?
Oh.
Never mind.
Just get out there with a comfy seat and
PADDLE ON!
-Frank in Miami
Never tried…
to see how far I could go in a day. Many years ago a buddy and I, with no training but in pretty good shape, entered a downriver canoe race on a small class one river–long dead pools and short riffles. We were in a 17 foot Grumman that had seen better days; the bottom was wavy and had a lot of “reverse rocker”. Horrible boat to try to paddle fast. We did 21.5 miles in 3.5 hours. I believe, given how I felt at the end of it, I could have paddled at half that speed for ten hours in that boat, so I figure 30 miles a day in a well-designed boat on that kind of water would be absolutely no problem if you’re in decent shape.
well
the current world record on flat water is i think 261 miles in 24-hours.
ive done around 200 in a tandam canoe on the yukon in 24 hours and solo ive done in the 80s often with current etc. flat water was more in the 50 range being a reservour or lake type current. bob bradford and clark eid did well over 135 for 18 consecutive days paddling the 2340 miles of the entire mississippi river
If you are a beginner and you are
going 10 miles at 3.5, that is great, but you are probably bracing too hard on the foot pegs if your knees are hurting.
Every so often stretch your legs out in between the foot braces, and don’t push too hard on them.
All the long mileage comes with time in the boat.
It’s kind of like training for you first running marathon - (LSD) Long slow distance!
Jack L
Not as hard as you would think
30 nautical miles (roughly 34.5 miles) isn’t bad.
Divide your distance by time and you can see that average speed is actually pretty slow. If you paddle 12 hrs, your average speed only needs to be 2.5 nm/hr, or 2.9 mph.
My training runs last year for the MR340 were 36 miles, and usually took me about 9-10 hours.
On rivers, you would be able to do much much more very easily.
I assume you are talking about flat water though.
Distance? Easy!
In 2009, with heart disease and not having been in a canoe in about 30 years, this old fat guy (me) and his wife took a canoe 26 miles in 6 hours. We went DOWN the Rifle River (and “only” turned over 4 times.) You really need only paddle to steer. 
Hard to Believe
261 miles = 450 kms
Since the world record on moving water is around 350 kms paddled in 24hrs, hard to believe to record for flat water is 100kms more.
24-hr World Record
Curious, I looked it up.
The record was set last fall, and is 261 miles on moving water.
http://www.somegoodadventure.com/paddlesports/24hr-kayak-record-on-the-yukon-river/
So moving water record is 261 miles
whats the flatwater record?
Ya
You had the # right. It was a lot more than I had thought. 450km in one day… crazy.
day distance
hane done 70 miles 20 times shortest time 8 hours slowest 12. in the 90 the first day is 35 miles about 6 hours.
train!!!
26 miles…but…
My personal record is 26 Miles in 3 1/2 hours, including a quick lunch break. We did have a little help from moving water though 
http://www.youtube.com/watch?v=ApxF_MDZ9Lo
The Lehigh was flowing about 10,000 cubic feet per second if you take creek inflow into consideration, the release from the dam was 8200 cfs but we had a lot more by the end of the gorge. So in our 3.5 hours, we took advantage of about 950,000,000 gallons of moving water…the amount of horsepower that must represent is staggering.
The most I ever paddled on flatwater was about 15 miles in a day, I don’t remember how many hours it took though it wasn’t a whole day by any means.