diff --git a/zshrc b/zshrc
index 5e243b1..a461b24 100644
--- a/zshrc
+++ b/zshrc
@@ -118,6 +118,10 @@ if R --version &>/dev/null; then
   alias R='R --no-save --no-restore-data'
 fi
 
+if command -v ssh-add &>/dev/null; then
+  alias ssh-add='ssh-add -t 1h'
+fi
+
 unsetopt correct_all
 bindkey '^R' history-incremental-search-backward