My understanding is that as long as you keep it inside the TFSA, you can trade as many times as you wish. I also want add this year's allowed amount to mine. Currently have DBXUS and DXWD (in separate accounts). Trying to decide what to buy. Fancy DBXJP.
You can buy and sell EFT's in that account as you please as long as you stick to the basic rules. I do however see that in Canada there were some issues regarding traders using their TFSA accounts as trading accounts, so my advice would be to try and limit the amount of transactions you do on an annual basis in this account. You don't want to wake up too many sleeping dogs.