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diff --git a/toolkit/components/glean/bindings/private/Timespan.h b/toolkit/components/glean/bindings/private/Timespan.h
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+++ b/toolkit/components/glean/bindings/private/Timespan.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_glean_GleanTimespan_h
+#define mozilla_glean_GleanTimespan_h
+
+#include "mozilla/Maybe.h"
+#include "nsIGleanMetrics.h"
+#include "mozilla/glean/fog_ffi_generated.h"
+
+namespace mozilla::glean {
+
+namespace impl {
+
+class TimespanMetric {
+ public:
+  constexpr explicit TimespanMetric(uint32_t aId) : mId(aId) {}
+
+  /**
+   * Start tracking time for the provided metric.
+   *
+   * This records an error if it’s already tracking time (i.e. start was already
+   * called with no corresponding [stop]): in that case the original
+   * start time will be preserved.
+   */
+  void Start() const { fog_timespan_start(mId); }
+
+  /**
+   * Stop tracking time for the provided metric.
+   *
+   * Sets the metric to the elapsed time, but does not overwrite an already
+   * existing value.
+   * This will record an error if no [start] was called or there is an already
+   * existing value.
+   */
+  void Stop() const { fog_timespan_stop(mId); }
+
+  /**
+   * **Test-only API**
+   *
+   * Gets the currently stored value as an integer.
+   *
+   * This function will attempt to await the last parent-process task (if any)
+   * writing to the the metric's storage engine before returning a value.
+   * This function will not wait for data from child processes.
+   *
+   * This doesn't clear the stored value.
+   * Parent process only. Panics in child processes.
+   *
+   * @param aPingName The (optional) name of the ping to retrieve the metric
+   *        for. Defaults to the first value in `send_in_pings`.
+   *
+   * @return value of the stored metric, or Nothing() if there is no value.
+   */
+  Maybe<int64_t> TestGetValue(const nsACString& aPingName = nsCString()) const {
+    if (!fog_timespan_test_has_value(mId, &aPingName)) {
+      return Nothing();
+    }
+    return Some(fog_timespan_test_get_value(mId, &aPingName));
+  }
+
+ private:
+  const uint32_t mId;
+};
+}  // namespace impl
+
+class GleanTimespan final : public nsIGleanTimespan {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIGLEANTIMESPAN
+
+  explicit GleanTimespan(uint32_t aId) : mTimespan(aId){};
+
+ private:
+  virtual ~GleanTimespan() = default;
+
+  const impl::TimespanMetric mTimespan;
+};
+
+}  // namespace mozilla::glean
+
+#endif /* mozilla_glean_GleanTimespan_h */