update docs

README.md

@@ -58,6 +58,8 @@ Before running Bubble, you need to build it. Run:
 
 This will grab all the submodules and perform an initial build of all components.
 
+This will take a while to complete, please be patient.
+
 ## Deployment Modes
 Bubble runs in three different modes.
 In order to launch and use your own Bubble that you can connect devices to and use,

docs/dev.md

@@ -27,6 +27,8 @@ After running the system setup above, run:
 
 This will grab all the submodules and perform an initial build of all components.
 
+This will take a while to complete, please be patient.
+
 ## Bubble environment file
 You will need a file named `${HOME}/.bubble.env` which contains various environment variables required to run the server.