diff --git a/.github/workflows/esy.yml b/.github/workflows/esy.yml
index 0251e32..89ce3d9 100644
--- a/.github/workflows/esy.yml
+++ b/.github/workflows/esy.yml
@@ -16,6 +16,8 @@ jobs:
   build:
     name: Build and test
     runs-on: ${{ matrix.os }}
+    # Most runs take between 20 and 90 minutes, but we leave some extra time, notably because windows is a bit inconsistent and can take longer to build.
+    timeout-minutes: 120
 
     strategy:
       fail-fast: false
diff --git a/.github/workflows/js.yml b/.github/workflows/js.yml
index 28f3a02..1770b13 100644
--- a/.github/workflows/js.yml
+++ b/.github/workflows/js.yml
@@ -13,6 +13,8 @@ jobs:
   build:
     name: "Build with emsdk"
     runs-on: ubuntu-latest
+    # Most runs take between 10 and 15 minutes, but we leave some extra buffer.
+    timeout-minutes: 60
 
     steps:
       - name: Setup node.js
diff --git a/.github/workflows/opam.yml b/.github/workflows/opam.yml
index 2464296..444d709 100644
--- a/.github/workflows/opam.yml
+++ b/.github/workflows/opam.yml
@@ -13,6 +13,8 @@ jobs:
   build:
     name: Build and test
     runs-on: ${{ matrix.os }}
+    # Most runs take between 20 and 30 minutes, but we leave some extra time, notably because windows is a bit inconsistent and can take longer to build.
+    timeout-minutes: 90
 
     strategy:
       fail-fast: false