1. autofetch on zle-line-init

2. GIT_AUTO_FETCH_INTERVAL

plugins/git-auto-fetch/README.md

 # Git auto fetch
 
-Automatically fetches all changes from all remotes every time you cd into yout git-initialized project.
+Automatically fetches all changes from all remotes while you are working in git-initialized directory.
 
 ####Usage
 Add ```git-auto-fetch``` to the plugins array in your zshrc file:
@@ -8,7 +8,14 @@ Add ```git-auto-fetch``` to the plugins array in your zshrc file:
 plugins=(... git-auto-fetch)
 ```
 
-Every time you change directory to your git project all remotes will be fetched in background. Log of ```git fetch --all``` will be saved into .git/FETCH_LOG
+Every time you launch a command in your shell all remotes will be fetched in background.
+By default autofetch will be triggered only if last fetch was done at least 60 seconds ago.
+You can change fetch interval in your .zshrc:
+```
+GIT_AUTO_FETCH_INTERVAL=1200 #in seconds
+```
+Log of ```git fetch --all``` will be saved into .git/FETCH_LOG
+
 
 ####Toggle auto fetch per folder
 If you are using mobile connection or for any other reason you can disable git-auto-fetch for any folder:

plugins/git-auto-fetch/git-auto-fetch.plugin.zsh

-function git-fetch-on-chpwd {
+GIT_AUTO_FETCH_INTERVAL=${GIT_AUTO_FETCH_INTERVAL:=60}
+
+function git-fetch-all {
   (`git rev-parse --is-inside-work-tree 2>/dev/null` &&
   dir=`git rev-parse --git-dir` &&
   [[ ! -f $dir/NO_AUTO_FETCH ]] &&
+  (( `date +%s` - `date -r $dir/FETCH_LOG +%s` > $GIT_AUTO_FETCH_INTERVAL )) &&
   git fetch --all &>! $dir/FETCH_LOG &)
 }
 
@@ -15,6 +18,15 @@ function git-auto-fetch {
     echo "${fg_bold[red]}disabled${reset_color}")
 }
 
-chpwd_functions+=(git-fetch-on-chpwd)
-git-fetch-on-chpwd
-unset git-fetch-on-chpwd
+eval "original-$(declare -f zle-line-init)"
+
+function zle-line-init () {
+  git-fetch-all
+  original-zle-line-init
+}
+zle -N zle-line-init
+
+# chpwd_functions+=(git-fetch-on-chpwd)
+# git-fetch-on-chpwd
+unset git-auto-fetch
+unset original-zle-line-init