I would like to create a Netflix account and redeem a gift card that I don't have yet. I would buy this in two days (or a little later).
Can I only redeem the card in 2 days or later, even if I create the account now?
If you want to start looking straight away, as far as I know you have to select a payment method when creating the account. (So you either need bank information or a voucher) Just check whether the 30 day test version is still available, if so then it should work. But you can also simply create the account in two days, or when you get the voucher. If you want to buy vouchers in advance then that's no problem, you can redeem them whenever you want. I received a lot of Netflix vouchers on my birthday (September) and redeem a different one every month, even if they were bought more than half a year ago. Never had any problems with it.