In a players turn, can you build multiple stages of your wonder.Example: can you spend 3 civil actions to build 3 stages at once ( if you have the resources of course)? Or are you allowed just building one every turn, and eventually an extra one with a little help from a card or so.
Like any other civil action, you can repeat it on your turn as many times as you like, so long as you have the necessary actions and resources available to spend, and don't run into any limits (like urban building limit or hand limit).
You can add new workers multiple times per turn, build multiple buildings or units per turn, or grab multiple cards from the card row, build multiple wonder stages, and develop multiple new technologies. Just have to pay for it all.