The best time to have kambo is when the sun is rising, around 7 or 8 AM. Then you need to drink minimum of 1.5 liters of caicuma "soup". Following your kambo sessions it is recommended to take a shower as soon as possible. After kambo to integrate the healing you need to follow a 3 day diet. It is as follows: no alcohol, no tobacco, no sex, no red meat, nothing that has sweet flavour (includes fruits and cooked tubers like sweet potatoes) and no strong sun on the head. And then you get the maximum healing.
There is also a specific kambo initiation in the Yawanawa tradition that i want to do but for that i would need to go to their tribe in Brazil and do a dieta. When i get money that is the first thing i'll do :)