Keep a reserve of credits that lasts
Extra credits are the reserve for the episode that runs over, and their lifetime decides how early they can be bought. Frameo's wallet credits never expire. From 5 source pages, read 2026-09-25 to 2026-10-25; no maker pays to be listed.
Kling AI's and Vidu's purchased credits last two years and Pika's top-ups a year, long enough to buy at the start of a season.
A reserve bought where credits expire in weeks is only useful for the next few episodes: Midjourney's purchased Fast hours expire after 60 days.
Check which credits a tool spends first. Frameo spends plan credits before wallet credits, which keeps the reserve intact until it is needed.
| Tool | Limit | Stated on the page |
|---|---|---|
| Frameo | Top-ups | Wallet credits bought as top-ups never expire |
| Kling AI | Top-ups | Purchased credits valid for two years |
| Vidu | Top-ups | Purchased credits valid for two years |
| Pika | Top-ups | Top-up credits carry over and expire 365 days after purchase |
| Midjourney | Top-ups | Extra Fast hours bought from the account page, expiring after 60 days |
Inclusion rule. Readings from the quota sheet that this page cites. Order. The order the page cites them in.
1Quoted from the plan pages
Wallet credits never expire, and are used after your monthly plan credits.
Frameo, pricing page
Purchased Credits: Valid for 2 years from the date of purchase.
Kling AI, membership plans page
Purchased Credits: Additional credits available for purchase on demand, valid for 2 years.
Vidu, pricing page
Credits you buy as top-ups carry over and expire 365 days after purchase.
Pika, pricing page
Click the "Buy more Fast hours" button and select the amount of Fast time you wish to add. Keep in mind, these purchased hours come with a 60-day expiration
Midjourney, extra Fast time article
- Top-up creditsWallet credits bought as top-ups never expire
- Credits FAQPurchased credits valid for two years
- Credits FAQPurchased credits valid for two years
- Credits FAQTop-up credits carry over and expire 365 days after purchase
- Purchasing Extra Fast TimeExtra Fast hours bought from the account page, expiring after 60 days
2Scaling up, as one tool tells it
Limits aside, the series work behind “Keep a reserve of credits that lasts” is described in SceneMixer's guides like this:
It is the reference every later segment points at, which is what keeps a character's face and a location consistent across an episode.
SceneMixer, Glossary — “What is a setup image for?” (read 2026-10-13)
The cast is generated once, at the start, as full-body reference sheets. Every segment that features a character is generated against that character's sheet, with face and body crops attached as references — so the face in episode 1 is the face in episode 40.
SceneMixer, AI Short Drama Generator — “How does it keep the same actor across episodes?” (read 2026-10-13)