Can you give us an idea of what you are eating and what you are experiencing. Detoxification symptoms are usually either an indication of undereating or of not eating enough micronutrients, or of being deficient in something important for liver detoxification. It should feel relatively symptomless. Usually "detox" symptoms are a sign of autointoxication (where toxins are introduced to the liver faster than the liver can process them).
You might still experience some mild symptoms for some time if you are particularly burdened with toxins (if you have been living an extremely un healthy lifestyle for some time (lots of drugs, poor nutrition etc)). How long is up to your body, not us so we cannot give you that answer.
As for detox finishing, that doesn't happen ever Detoxification is a lifelong process that your body always does. There will always be exposure to new toxins from outisde the body and created inside the body and so it will always be detoxing. Same with healing. I guess the real question is - How long until I feel healthy again?
The answer to that question is no less easy and is still very much similar: It is up to your body to decide that. You cannot rush or force healing. Your body will do things precisely at the pace that it can handle it safely and efficiently.
What can you do in the meantime? Cultivate patience and practice healthful living consistently. Make sure that you meet your physical and emotional needs adequately.
I think it all depends... If you were 40 years old, obese, a smoker, ate red meat 20 times a day and suddenly became lfrv then I think your detox period could last maybe even months...!
I have been blessed with great genetics and never ever get sick even when I am not eating so well... Every time in the past I had done a detox such as a juice feast or converting to raw I had very very few symptoms... Mostly just a little tired. Although my boyfriend is a regular vegetarian and when he comes to my house and eats all of my raw vegan foods he gets... 'severe and sudden bowel movements' in just a few hours, becomes grumpy, and gets headaches. LOL
A general rule of thumb is to divide your age by 15 and that is how long it will take to generally heal your body from being 100% low fat raw vegan, but it is different for every person.
I don't recommend fasting. Just do this diet, correctly. Which means eat lots of delicious fruits and not irritants such as garlic or spices or teas or whatnot.
I had Ulcerative Colitis. Most of the symptoms were gone within a month (and they were debilitating for me) ... but I have flare backs every now and again. Out of curiosity I had a vegan cooked meal during Thanksgiving and it went down ok. But my body simply felt like I had put inferior food into my engine than usual.
Once you start, you really can't go back... nothing can make you feel better. One thing I will say is that every month or two or so, I will have a minor episode, perhaps after having eaten some unripe fruit and assume overconfidence of my state of health, where some symptoms come back for a bit. But overall, I've never felt better.
chinese medicine has many flaws, I wouldn't put any importance on their food recommendations.
high cellulose veggies are not ideal, here is a nice list:
Besides using animals in much of their prescriptions for health, like bear bile:
Jackfruitfighter has some interesting things to say here:
detox never stops but you peak around 2 yrs.