Min and max number of satellites

I don’t know there is a definitive answer for this. Generally they want you to use the Series 9 Configuration methods. Increasing the mask angle might have the most direct impact on accuracy. In post processing you’d need contemporaneous data from two sources, and you can usually either pick a mask angle for exclusion there, or they can be rejected as outliers if the data is unhelpful.
Interactions and personal observation is that there is a 32 satellite ceiling on those actually used in a navigation solution. This might be to stop legacy stuff breaking, or just keep the processing bandwidth, and matrices, in check.
https://portal.u-blox.com/s/question/0D52p0000A8lz6oCQA/is-there-a-way-of-knowing-which-satellites-an-f9p-module-is-using-in-an-rtk-solution
https://portal.u-blox.com/s/question/0D52p00009Tesk6CAB/neom9n-pubx03-number-of-gnss-satellites-tracked-32-42-92

Clive1, thank you for answer! Also in U-blox F9P specisication write: 184–channel u–blox F9 engine. But in U-center write max 60 channels. Is it hardware limit on Ardusimple board?