session CHANGE new timeout introduced

Also described with other options in README.
diff --git a/src/session.c b/src/session.c
index afc89f5..b52de4e 100644
--- a/src/session.c
+++ b/src/session.c
@@ -333,7 +333,7 @@
     }
 
     if (session->ti_lock) {
-        r = nc_timedlock(session->ti_lock, NC_READ_TIMEOUT * 1000, __func__);
+        r = nc_timedlock(session->ti_lock, NC_SESSION_FREE_LOCK_TIMEOUT, __func__);
         if (r == -1) {
             return;
         } else if (!r) {