Work on m300.

README.md

@@ -351,9 +351,14 @@ There are also some other parameters available for handling time:
 - tree_start_time : If set the specified times are time from the tree_start_time. Otherwise the specified times are abolute.
 - node_start_time : The actual time the node execution was started.
 
-The parameters above can be set in the common_params block.
-
-Not yet fully implemented.
+The parameters above can be set in the common_params block. If a
+parameter is not set then lb times are assumed to be at "0".  And ub
+times are assumed to be "infinity" or the largest allowed time. In
+practise the largest allowed time assuming integer time is usually set
+to 3600 seconds but that is just to make the constraint solving more
+efficient.
+
+The functionality above is not yet fully implemented.
 
 ## 1.6 Constraints