Actor caching lowered to 3 hours.

activitypub.c

@@ -1199,7 +1199,7 @@ xs_dict *msg_actor(snac *snac)
     int n;
 
     /* everybody loves some caching */
-    if (time(NULL) - object_mtime(snac->actor) < 6 * 3600 &&
+    if (time(NULL) - object_mtime(snac->actor) < 3 * 3600 &&
         valid_status(object_get(snac->actor, &msg))) {
         snac_debug(snac, 2, xs_fmt("Returning cached actor %s", snac->actor));