Hi SB
Thai Foot Massage takes from 30 to 60 minutes depending on how indepth you wish to treat. I personally think that with all therapies, you should do treatments that you like done to yourself. A form of empowerment. As for course fees, that depends if you think it's worthwhile.
One major benefit in training in TFM is that it will provide a basic and effective reflexology routine. I have taught it to reflexologists that decided that it was a better format than the boring thumbwalking technique (which induces RSI) used in western reflexology.
I can't say much about TFM course in the UK, apart from most are too short and should be at least 2 days of training. I have done 2 TFM courses I have in Thailand and both have been 2 full days of training. If I wasn't an experienced reflexologist and masseur, I would of wanted more time to practice.
Yes, TFM is worth learning. Would you make a living from it? I doubt it. You have to have more strings to your bow!
One thing I must say, don't believe the hype about TFM being ancient, and having elements of yoga, shiatsu and chinese acupressure, practiced for 1000's of years. This is nonsense!!!! TFM is Chinese style reflexology based on modern western foot reflex charts, which has been mixed with traditional Thai massage based on sen energy lines. It's a hybrid system developed approx. 9 years ago.
Best Wishes
TFM Pixie