How are you getting these results because I'm doing the exact same thing and my results are different.
20 days like we agreed upon as it is most relevant. Search by user "Lord Tony®" and choice of word "blockchip."
We didn't "agree upon" 20 days.
I searched for it without the 20 days limitation.
Even with the 20 days limitation, that's three other threads, when you said you only mentioned me once.
And you didn't say you mentioned me once in the last 20 days, you just said you only mentioned me once.
