I cannot fly and be there with 2 hours notice though. Sometimes flights are full and you can't get there at all with less than a few weeks notice. Often you can, but the cost for same day tickets can be very high.
Planning months in advance is done all the time, but it is hard. It is always easier to plan if you can look at the current most urgent project list and pick the top item. if you have to plan what will be on top in a few months that is a lot harder.