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kotlinlang

When did the `10.minutes` notation become stable? I'm pretty sure I've used in many projects without warnings, but now I see a `This declaration is experimental due to signature types and its usage must be marked (will become an error in future releases) with '@kotlin.time.ExperimentalTime' or '@OptIn(kotlin.time.ExperimentalTime::class)'`.

Thanks, that's what I thought, it's not a new thing.

I think I have a very old version of the Kotlin Gradle plugin but a recent version of the standard library

It could be that you're not importing `Duration.Companion.minutes` and you're using a slightly old stdlib (e.g. 1.7) and bringing in the deprecated top-level function from `Duration.kt` instead.