Creators credits (the currency you earn by selling content on the marketplace) are typically locked for approximately 30 days, until transactions are reconciled with the various platforms and storefronts. You can see the status of your credits in your monetization dashboard on mod.io.
This delay is due to first party storefronts’ own processing times, and to account for any potential refunds or cancelled transactions happening during that period. Once the funds are reconciled, they become unlocked for all creators in their wallet to process with payouts; or alternatively be reused for in-game transactions for games using virtual currency.