Tim Düsterhus and Derick Rethans have proposed a new `Time\Duration` class for PHP 8.6, designed to represent stopwatch-style or egg-timer durations for use in timeout APIs. The RFC targets the PHP 8.6 Polling API and is intended as the first step toward a modernized date/time API in PHP. The proposed API is intentionally minimal, using a seconds + nanoseconds internal representation (similar to Rust's and Java's Duration). Community discussion covers design questions including: why the highest unit is seconds internally (hours are supported via constructors), the absence of ISO 8601 serialization (deferred to PHP 8.7), omission of floating-point total methods (due to precision concerns), namespace choice (`Time` vs `DateTime`), and whether to use `add`/`sub` methods or a single variadic `sum` method. The RFC also addresses why the JavaScript Temporal API's `temporal_rs` library was not adopted as a backend implementation.
