diff --git a/VolZmap.cpp b/VolZmap.cpp
index 8eb4b4b..896d90d 100644
--- a/VolZmap.cpp
+++ b/VolZmap.cpp
@@ -776,7 +776,7 @@ VolZmap::CheckMapConnection( void)
                int nTerminated = 0 ;
                while ( nTerminated < nActiveThread) {
                   for ( int i = 0 ; i < nThreadMax ; ++ i) {
-                     if ( vRes[i].valid()  &&  vRes[i].wait_for( chrono::microseconds{ 1 }) == future_status::ready) {
+                     if ( vRes[i].valid()  &&  vRes[i].wait_for( chrono::microseconds{ 10}) == future_status::ready) {
                         vRes[i].get() ;
                         ++ nTerminated ;
                      }
diff --git a/VolZmapGraphics.cpp b/VolZmapGraphics.cpp
index 26a7b21..7f66c45 100644
--- a/VolZmapGraphics.cpp
+++ b/VolZmapGraphics.cpp
@@ -933,7 +933,7 @@ VolZmap::UpdateTripleMapGraphics( void) const
    int nTerminated = 0 ;
    while ( nTerminated < nBlockUpdated) {
       for ( int i = 0 ; i < m_nNumBlock ; ++ i) {
-         if ( m_BlockToUpdate[i]  &&  vRes[i].valid()  &&  vRes[i].wait_for( chrono::microseconds{ 1 }) == future_status::ready) {
+         if ( m_BlockToUpdate[i]  &&  vRes[i].valid()  &&  vRes[i].wait_for( chrono::microseconds{ 10}) == future_status::ready) {
             bOk = vRes[i].get()  &&  bOk ;
             ++ nTerminated ;
          }