API Reference > imodeljs-frontend > Tiles > TileTreeParams > expirationTime expirationTime expirationTime: undefined | BeDuration Optionally specifies the amount of time before tiles belonging to this tile tree are considered eligible for disposal after disuse. If unspecified, a default expiration time is chosen based on the tile tree's TileTreeParams.priority. see TileTree.prune Defined in core/frontend/src/tile/TileTreeParams.ts Line 41 Last Updated: 12 June, 2024