I already did 3 days in the past, also 5 days and I am not sure If I ever did more than 5. But no matter how many days I took I did not feel any difference. Probably the difference is there but I am not aware of it.
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4 days of wash out, resuming on the 5th day.
That seems to be good for me.
I’ve going to do a wash out remainder of December beginning today. Curious how this will play out for me with bloom. 
I usually do a 4 day washout after each ZP cycle. Sometimes 6 days if I change my stack.
I once did a 15 day washout while on vacation. This washout was good. Very little recon experienced while having bloom effects.