Updated FAQ

FAQ.md

@@ -1655,12 +1655,8 @@ and [what Google writes about it](https://developer.android.com/training/secure-
 <a name="faq50"></a>
 **(50) Can you add an option to synchronize all messages?**
 
-A synchronize all (download all) messages will not be added
-because it can easily result in out of memory errors and the available storage space filling up.
-It can also easily result in a lot of battery and data usage.
-Mobile devices are just not very suitable to download and store years of messages.
-You can better use the search on server function (see [question 13](#user-content-faq13)), which is faster and more efficient.
-Note that searching through a lot of messages stored locally would only delay searching and use extra battery power.
+You can synchronize more or even all messages by long pressing a folder (inbox) in the folder list of an account (tap on the account name in the navigation menu)
+and selecting *Synchronize more* in the popup menu.
 
 <br />
 

app/src/main/java/eu/faircode/email/ServiceSynchronize.java

@@ -112,7 +112,7 @@ public class ServiceSynchronize extends ServiceBase implements SharedPreferences
     private MediatorState liveAccountNetworkState = new MediatorState();
 
     private static final long PURGE_DELAY = 60 * 1000L; // milliseconds
-    private static final long QUOTA_INTERVAL = 10 * 60 * 1000L; // milliseconds
+    private static final long QUOTA_INTERVAL = 15 * 60 * 1000L; // milliseconds
     private static final long QUIT_DELAY = 5 * 1000L; // milliseconds
     private static final long STILL_THERE_THRESHOLD = 3 * 60 * 1000L; // milliseconds
     static final int DEFAULT_POLL_INTERVAL = 0; // minutes