What grace period do you give friends before you pull the trigger and book the trip without them?

I am heading to South America for about a month in late February. I have done business there already, and it is a possible place for retirement, so I'm definitely doing this trip, I have booked my flights to go down, but have not booked hotels because of course friends are interested in going, however they are not busting a move on hotel research or apartment research and of course haven't paid me any money, at what point do I say F them and just book it solo? I have friends there as well to chill with and they are expecting me either way.

What grace period do you give friends before you pull the trigger and book the trip without them?
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