Swarm is what handles communication between the editor and Lightmass.
When I start the Build, a little Swarm icon appears in my Windows bar (called system tray, I keep mine at the bottom). I click on it (or double-click, I can’t recall) and it opens another window where you can edit things in there.
If you’re on Windows, you can find the swarm agent in your system tray, located by the clock on your taskbar by default. You’ll want to look for a small black “S” surrounded by yellow. Once you double click on it, it’ll bring up the window that ZenArtist mentioned.
Once that’s open, open the settings tab and change the setting for “EnableStandaloneMode” to true. You’ll probably want this unless you know that your network has been hooked up to distribute the light bakes across the network.
i found it ,hope it helps cause this sure is taking long and all i did was add a smal wood cabbin in my level 
Hi guys, I’ve just worked on an asset to improve compile time: Compiler Booster in Code Plugins - UE Marketplace
Thank you!
