Increase default timeout in system specs

.env.test

@@ -1,6 +1,14 @@
 # ENV vars for the test environment
 # Override locally with `.env.test.local`
 
+# Test env specific variables
+#
+# Adjust this to your computer. When you start test-driven development, you may
+# want to reduce this value to avoid waiting for a test that you expect to fail.
+CAPYBARA_MAX_WAIT_TIME="10"
+
+# General app specific variables
+
 # Locale for translation. Using a locale other than `en` tests the
 # successful fallback to `en`.
 LOCALE="en_TST"

spec/system/support/capybara_setup.rb

@@ -5,8 +5,9 @@
 Capybara.enable_aria_label = true
 
 # The default wait time is 2 seconds. Small is good for test-driven development
-# ensuring efficient code but CI can be a bit slow. We want to avoid flakiness.
-Capybara.default_max_wait_time = 10 if ENV["CI"]
+# ensuring efficient code but some machines can be a bit slow.
+# And we want to avoid flakiness.
+Capybara.default_max_wait_time = ENV.fetch("CAPYBARA_MAX_WAIT_TIME").to_i
 
 # Normalize whitespaces when using `has_text?` and similar matchers,
 # i.e., ignore newlines, trailing spaces, etc.