Increased timeout on ppc64le and big-endian

Author: radarhere

Tests/test_file_tiff.py

@@ -18,6 +18,8 @@
     assert_image_similar,
     assert_image_similar_tofile,
     hopper,
+    is_big_endian,
+    is_ppc64le,
     is_pypy,
     is_win32,
 )
@@ -950,7 +952,7 @@ def test_string_dimension(self) -> None:
             with pytest.raises(OSError):
                 im.load()
 
-    @pytest.mark.timeout(6)
+    @pytest.mark.timeout(10 if (is_ppc64le() or is_big_endian()) else 6)
     @pytest.mark.filterwarnings("ignore:Truncated File Read")
     def test_timeout(self, monkeypatch: pytest.MonkeyPatch) -> None:
         with Image.open("Tests/images/timeout-6646305047838720") as im: