diff --git a/pkgs/development/compilers/ghc/8.10.1.nix b/pkgs/development/compilers/ghc/8.10.1.nix
index d3835d01e5a..42eb994b8fe 100644
--- a/pkgs/development/compilers/ghc/8.10.1.nix
+++ b/pkgs/development/compilers/ghc/8.10.1.nix
@@ -246,6 +246,7 @@ stdenv.mkDerivation (rec {
     homepage = "http://haskell.org/ghc";
     description = "The Glasgow Haskell Compiler";
     maintainers = with stdenv.lib.maintainers; [ marcweber andres peti ];
+    timeout = 24 * 3600;
     inherit (ghc.meta) license platforms;
   };
 
diff --git a/pkgs/development/compilers/ghc/8.10.2.nix b/pkgs/development/compilers/ghc/8.10.2.nix
index f3d64ced81e..41aa5e16ba1 100644
--- a/pkgs/development/compilers/ghc/8.10.2.nix
+++ b/pkgs/development/compilers/ghc/8.10.2.nix
@@ -107,9 +107,9 @@ stdenv.mkDerivation (rec {
 
   outputs = [ "out" "doc" ];
 
-  # https://gitlab.haskell.org/ghc/ghc/-/issues/18549 
-  patches = [ 
-    ./issue-18549.patch 
+  # https://gitlab.haskell.org/ghc/ghc/-/issues/18549
+  patches = [
+    ./issue-18549.patch
   ];
 
   postPatch = "patchShebangs .";
@@ -190,7 +190,7 @@ stdenv.mkDerivation (rec {
   strictDeps = true;
 
   # Don’t add -liconv to LDFLAGS automatically so that GHC will add it itself.
-	dontAddExtraLibs = true;
+  dontAddExtraLibs = true;
 
   nativeBuildInputs = [
     perl autoconf automake m4 python3 sphinx
@@ -242,6 +242,7 @@ stdenv.mkDerivation (rec {
     homepage = "http://haskell.org/ghc";
     description = "The Glasgow Haskell Compiler";
     maintainers = with stdenv.lib.maintainers; [ marcweber andres peti ];
+    timeout = 24 * 3600;
     inherit (ghc.meta) license platforms;
   };
 
diff --git a/pkgs/development/compilers/ghc/8.6.5.nix b/pkgs/development/compilers/ghc/8.6.5.nix
index a5d2bb5c88d..3d660dd9521 100644
--- a/pkgs/development/compilers/ghc/8.6.5.nix
+++ b/pkgs/development/compilers/ghc/8.6.5.nix
@@ -256,6 +256,7 @@ stdenv.mkDerivation (rec {
     homepage = "http://haskell.org/ghc";
     description = "The Glasgow Haskell Compiler";
     maintainers = with stdenv.lib.maintainers; [ marcweber andres peti ];
+    timeout = 24 * 3600;
     inherit (ghc.meta) license platforms;
   };
 
diff --git a/pkgs/development/compilers/ghc/8.8.2.nix b/pkgs/development/compilers/ghc/8.8.2.nix
index 371a369496e..fbb75637df6 100644
--- a/pkgs/development/compilers/ghc/8.8.2.nix
+++ b/pkgs/development/compilers/ghc/8.8.2.nix
@@ -241,6 +241,7 @@ stdenv.mkDerivation (rec {
     homepage = "http://haskell.org/ghc";
     description = "The Glasgow Haskell Compiler";
     maintainers = with stdenv.lib.maintainers; [ marcweber andres peti ];
+    timeout = 24 * 3600;
     inherit (ghc.meta) license platforms;
   };
 
diff --git a/pkgs/development/compilers/ghc/8.8.3.nix b/pkgs/development/compilers/ghc/8.8.3.nix
index e26eacca204..538655a0d05 100644
--- a/pkgs/development/compilers/ghc/8.8.3.nix
+++ b/pkgs/development/compilers/ghc/8.8.3.nix
@@ -246,6 +246,7 @@ stdenv.mkDerivation (rec {
     homepage = "http://haskell.org/ghc";
     description = "The Glasgow Haskell Compiler";
     maintainers = with stdenv.lib.maintainers; [ marcweber andres peti ];
+    timeout = 24 * 3600;
     inherit (ghc.meta) license platforms;
   };
 
diff --git a/pkgs/development/compilers/ghc/8.8.4.nix b/pkgs/development/compilers/ghc/8.8.4.nix
index cd579c05ec5..e69766bccda 100644
--- a/pkgs/development/compilers/ghc/8.8.4.nix
+++ b/pkgs/development/compilers/ghc/8.8.4.nix
@@ -250,6 +250,7 @@ stdenv.mkDerivation (rec {
     homepage = "http://haskell.org/ghc";
     description = "The Glasgow Haskell Compiler";
     maintainers = with stdenv.lib.maintainers; [ marcweber andres peti ];
+    timeout = 24 * 3600;
     inherit (ghc.meta) license platforms;
   };
 
diff --git a/pkgs/development/compilers/ghc/9.0.1.nix b/pkgs/development/compilers/ghc/9.0.1.nix
index 23daee56a75..bdb1a7555c2 100644
--- a/pkgs/development/compilers/ghc/9.0.1.nix
+++ b/pkgs/development/compilers/ghc/9.0.1.nix
@@ -237,6 +237,7 @@ stdenv.mkDerivation (rec {
     homepage = "http://haskell.org/ghc";
     description = "The Glasgow Haskell Compiler";
     maintainers = with stdenv.lib.maintainers; [ marcweber andres peti ];
+    timeout = 24 * 3600;
     inherit (ghc.meta) license platforms;
   };