diff --git a/.github/workflows/verify-recording.yml b/.github/workflows/verify-recording.yml
index 28a0af88722..58159a2e7c6 100644
--- a/.github/workflows/verify-recording.yml
+++ b/.github/workflows/verify-recording.yml
@@ -51,6 +51,9 @@ on:
         type: choice
         options: [blacksmith, hosted, both]
         default: blacksmith
+      soak_secs:
+        description: "Adds the recording/soak/* cases at this length (seconds, at most 1800); set case_filter to recording/soak/* to run only them"
+        default: ""
   schedule:
     - cron: "41 3 * * *"
   pull_request:
@@ -149,13 +152,14 @@ jobs:
       matrix:
         runner: ${{ fromJSON(needs.scope.outputs.runners) }}
     runs-on: ${{ matrix.runner }}
-    timeout-minutes: 45
+    timeout-minutes: ${{ inputs.soak_secs != '' && 180 || 45 }}
     env:
       CAP_VERIFY_CAPTURE: display
       CAP_VERIFY_REQUIRE_CAPTURE: "1"
       CAP_VERIFY_TIER: ${{ needs.scope.outputs.tier }}
       CAP_VERIFY_REPEAT: ${{ inputs.repeat || (github.event_name == 'schedule' && '3') || '1' }}
       CAP_VERIFY_CASE: ${{ inputs.case_filter || '' }}
+      CAP_VERIFY_SOAK_SECS: ${{ inputs.soak_secs || '' }}
       CAP_VERIFY_KEEP: ${{ inputs.keep_artifacts && '1' || '' }}
       CAP_VERIFY_SCRATCH: ${{ github.workspace }}/verify-scratch
       CAP_VERIFY_REPORT_DIR: ${{ github.workspace }}/verify-report
diff --git a/crates/verify/tests/recording.rs b/crates/verify/tests/recording.rs
index 33c4a3a163b..5ad4ff5d698 100644
--- a/crates/verify/tests/recording.rs
+++ b/crates/verify/tests/recording.rs
@@ -114,7 +114,7 @@ struct Spec {
 }
 
 fn specs() -> Vec<Spec> {
-    vec![
+    let mut specs = vec![
         Spec {
             id: "recording/studio-screen/fragmented",
             tier: Tier::Fast,
@@ -289,6 +289,59 @@ fn specs() -> Vec<Spec> {
             mic: true,
             system_audio: true,
         },
+    ];
+    specs.extend(soak_specs());
+    specs
+}
+
+/// `CAP_VERIFY_SOAK_SECS`: at most 1800 s, because the microphone's 12-bit
+/// marker index (one marker every 0.5 s) runs out past 34 minutes.
+fn soak_specs() -> Vec<Spec> {
+    let Some(value) = std::env::var("CAP_VERIFY_SOAK_SECS")
+        .ok()
+        .filter(|v| !v.trim().is_empty())
+    else {
+        return vec![];
+    };
+    let seconds = value
+        .trim()
+        .parse::<f64>()
+        .ok()
+        .filter(|s| s.is_finite() && *s > 0.0)
+        .unwrap_or_else(|| {
+            panic!("CAP_VERIFY_SOAK_SECS={value:?} is not a positive number of seconds")
+        });
+    let seconds = seconds.min(1800.0);
+    vec![
+        Spec {
+            id: "recording/soak/studio-camera",
+            tier: Tier::Full,
+            mode: Mode::Studio {
+                fragmented: true,
+                camera: true,
+            },
+            seconds,
+            stimulus_fps: STIMULUS_FPS_30,
+            holds: vec![(seconds / 3.0, 3.0), (2.0 * seconds / 3.0, 10.0)],
+            camera_drops_at: vec![],
+            gated: true,
+            mic_delay: 0.0,
+            mic: true,
+            system_audio: true,
+        },
+        Spec {
+            id: "recording/soak/instant",
+            tier: Tier::Full,
+            mode: Mode::Instant,
+            seconds,
+            stimulus_fps: STIMULUS_FPS_30,
+            holds: vec![(seconds / 2.0, 5.0)],
+            camera_drops_at: vec![],
+            gated: true,
+            mic_delay: 0.0,
+            mic: true,
+            system_audio: true,
+        },
     ]
 }