The latest no deposit casinos typically offer one of two types of no deposit bonuses - free credit bonuses or free spins bonuses you can opt in for. For instance, you might only have 24 hours to wager a free spin win, or no deposit. Casinos also commonly place a time limit on how long you have to wager the bonus, once claimed.
In particular, no deposit free spins are typically valid for seven days, while some match bonuses can remain valid for up to 60 days.