When to Restart a New Fast

It's been about a month and a few days since I finished my 20 day Water Fast - I've since been on a vegan "diet."

Just wondering two things:

1.) How long after one completes the Water Fast is it okay to do a 10 day...I don't know, let's say either juice/vegetable fast or some other kind of cleansing regimen like The Master Cleanse? Should one wait more than a month? Two or three, maybe?

2.) Is it safe to do juice only (both vegetable and fruit) for 10 or more days? Or should one restrict it to the least amount of days as possible (i.e.: 2-3)?

Thanks.