I would like to use time range picker - advanced and create a formula that brings the last 4 business days
I found some information about full business days week, but I couldn't customized it to my case
Is it possible? Or I need to use in another way our of time picker?
You can eval time into the day of week:
| eval dayOfWeek=strftime(_time, "%A")
This will mean dayOfWeek will be, Monday, Tuesday... You could then say something like where dayOfWeek != "Saturday".