extensions/json-language-features/client/src/node/schemaCache.ts/JSONSchemaCache/getLastUpdatedInHours
class JSONSchemaCache:	getLastUpdatedInHours(schemaUri: string): number | undefined {
		const updateTime = this.cacheInfo[schemaUri]?.updateTime;
		if (updateTime !== undefined) {
			return (new Date().getTime() - updateTime) / 1000 / 60 / 60;
		}
		return undefined;
	}