I don't understand the this one. 1. to perform an action you must place a time marker on the board. 2. a time marker placed in a building by a player's earlier move may not perform an action in it. 3. to remove the time markers pay one time unit.
In other words every turn you pay one time marker to remove two time markers. So you have two time units in a turn????
The meeples are not time markers. They should be seen as claiming actions at a location. When you place one, you can spend 1-3 time at that location. So, if you are efficient, you will use one meeple to perform 3 time steps at one location. Then next turn you might be able to do the same. Again the next turn. Then, 4th turn, you might spend one time retrieving your meeples and place one to act for 2 more time units.
Of course, in practice you cannot be this efficient (there are not so many places where you can spend 3 time units), but you will often be able to spend 3 time with just 2 meeples, then use another meeple the next turn for a further 1 or 2 time, before spending a time to release them.
Bottom line: the meeples mark where you perform actions and do not represent the units of time you are spending there.