It is a one time thing. The account will keep it’s vote for delegate. If you want to change your vote you will have to unvote first and then vote someone else.
Some more details and links can be found here: https://redd.it/6b556q
You can vote 1 delegate per account. It depends on the delegate what you get. That might help: https://docs.google.com/spreadsheets/d/1FGo3FkC3uSWXGHatPQyny2brMWjAIJsHFCR-Lhkl_m0/edit#gid=0
Or just vote for me.
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