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While Linode's billing is monthly by default, it's also prorated. This means that when you remove a Linode from your account, the account is issued a prorated service credit for the unused time in the billing period. Service credit is always used for further services before charging the card on file.

In other words, you can spin up multiple Linodes, remove them the next day, and all you're really paying for is the day you had them deployed. There's a document on Linode billing located here: http://library.linode.com/linode-platform/billing/