Got mine in under 3 hours.
It was a SuperCub(180HP) with AlaskanBush tires. Only made three landings on pavement, rest were on river beds or peoples back yards.
We only needed 180ft(I was a rookie) to land and 100ft to takeoff:rawk:. Talk about the need of rudder when flying those!
Not meaning to be a jerk, but I would contend that flying / getting a tailwheel endorsement in a plane like this is significantly easier than operating the low powered (sub-100 hp) tailwheels.
The reason I say this is because when there is a high power engine, there is very little time spent rolling with the tail in the air during takeoff. It's pretty much, "Hit the power, lift the tail, pull back and fly." If the plane starts swerving...uhhh...who cares? Just pull back and fly.
In some planes that sit at the proper AoA, you don't even have to lift the tail off. Just hit the power, roll for a ways, and off you go, soaring skyward from the three point position.
Same advantages can be applied to botched landings. Start heading for the weeds after landing? Just hit the power and get off the ground before you reach the edge of the runway and you'll be fine.
In low powered machines, none of these things are possible, so it forces a person to keep tighter control from the start. Go arounds are less of a viable option, so you can't let it get away from you.
I'm not saying low power or high power tailwheel planes are better or worse to train in. In fact, high power tailwheels are probably a bit safer because of the "outs" the extra power gives. A person should be aware of the differences if they're serious about learning tailwheel flying though.
These reasons are why I believe I did fine in a 150 hp Citabria for my initial endorsement, then felt like I was starting over in my 85 hp Cessna 140. I had to learn how to spend more time on two wheels in my 140.
Oh, and for what it's worth, I'd never heard of using a "one wheel taxi" for training until reading this thread. I'd seen it done in air shows before, but I've seen a lot of things done in air shows that I wouldn't try as a training exercise. +1 for not being comfortable with one wheel taxis.