diff --git a/config/test.exs b/config/test.exs
index 883ee037aa..7d4bb778f5 100644
--- a/config/test.exs
+++ b/config/test.exs
@@ -48,3 +48,5 @@ config :plausible, Plausible.HelpScout,
   req_opts: [
     plug: {Req.Test, Plausible.HelpScout}
   ]
+
+config :plausible, Plausible.Session.Salts, interval: :timer.hours(1)
diff --git a/lib/plausible/session/salts.ex b/lib/plausible/session/salts.ex
index 78938ed713..a7fd2eca49 100644
--- a/lib/plausible/session/salts.ex
+++ b/lib/plausible/session/salts.ex
@@ -42,7 +42,8 @@ defmodule Plausible.Session.Salts do
       end
 
     true = :ets.insert(name, {:state, state})
-    Process.send_after(self(), {:refresh, now}, :timer.seconds(90))
+    interval = Application.get_env(:plausible, __MODULE__)[:interval] || :timer.seconds(90)
+    Process.send_after(self(), {:refresh, now}, interval)
     :ok
   end