Can I reveal NFTs on different periods of time/stages?

Yes, you can!

To do so, you'll need to follow these simple guidelines:

For the FIRST wave of NFTs

1. Create your KoalaMint Collection and when creating the contract specify max_supply with the total amount of NFTs that will be released under the collection (first stage + second stage +... subsequent stages).
2. Upload the first wave of assets.
3. Sell your first wave of NFTs.
4. Reveal your first wave of NFTs.

For the SECOND and subsequent wave of NFTs

1. Create a new collection on KoalaMint.
2. Re-use the original contract, select it from the dropdown menu.
3. Upload the second wave of assets.
4. Sell your second wave of NFTs.

Bear in mind the second wave of NFTs will be automatically revealed after you finish the setup process.

This is because the Reveal status is applied on a contract level, and it was already Revealed on the first wave of NFTs.