This is how it worked out for us.
DS2 was put into full leg casts on both legs at 1 week old (spent first week in transitional care ward).
First the physio's manipulate the feet in order to gain several 'scores', so they can see how the feet are improving over the weeks.
They then apply cast to both feet/legs, these cover the feet and go right up the top of the leg and are bent at the knee, in order to prevent the cast slipping.
It doesn't take long to do and casts dry within minutes.
This was done on a Monday morning and whole think takes less than 30 mins.
DS2 then remained in these casts until Sunday night, when we would bath him and remove the casts. They would go soft in the water and you simply unwrap them, this takes around 15 minutes but is easier with 2 of you (some hospitals ask you to remove them in the morning of your next appointment, or do it themselves).
The following day we went to hospital where the whole process was repeated, this continued for 8 weeks or so.
After this DS2 had a minor operation of his heel called a tenotomy, where a tiny cut is made at the back of each heel and the tendon cut. This was done under GA at my hospital, but some hospitals do it under LA. This procedure literally takes minutes to complete.
After this DS2 was in casts for 2 further weeks, the next visit to the hospital was for the fitting of boots and bars.
Most people think of these as splints or something similar, but they aren't like that, they are little sandal type boots connected by a bar underneath, that keep the feet pointing outwards. It is very similar to a snowboard set up.
The boots and bars bothered DS2 for a few days, as his legs no longer operated independantly (when he raised one the other had to follow, iyswim). Also we had to move him from moses basket to cot, adapt car seat slightly, make sure highchair had removeable bar in between legs etc. However with in a few days everyone was used to them.
DS2 had to stay in boots and bars for 23 hours a day until he was 6 months old, with checkups at the hospital every 2 months or so to check everything was going ok.
After 6 months it changed to being in the boots and bars for 14 hours a day (night time and naps only), which he will continue with until he is 4. We now see the physios once every 3 months or so, to check if he needs bigger boots etc (he has just got his first new pair, light blue and very nice).
His talipes are in affect fixed now, the boots and bars are just there to maintain it until he is 4 and the risk of regression is over.
So in my opinion it isnt overly time consuming once the cast stage is over and the visits to the hospital cut down, I admit it is a bit of a pain in boots and bar stage, having to wear clothes with no feet etc, but you really do get used to it in no time.
As long as you make sure you keep follow the method and don't slack with boots and bars times etc, talipes is no longer something to worry about.
I am not sure about hospitals, as I am in Devon, but I am pretty sure that most hospitals are doing the ponseti method now, as previously mentioned, the STEPS charity would have good information on this.
If I manage to get the photos from DS2 physio, I will post some before after ones, so you can see how successful the ponseti method is.
Hope this helps, if you have any questions, please give me a shout.