feat: time-based UD

end2end-tests/cucumber-features/monetary_mass.feature

@@ -3,7 +3,7 @@ Feature: Balance transfer
   Scenario: After 10 blocks, the monetary mass should be 60 ĞD
     Then Monetary mass should be 30.00 ĞD
     Then Current UD amount should be 10.00 ĞD
-    When 10 blocks later
+    When 15 blocks later
     Then Monetary mass should be 60.00 ĞD
     When 10 blocks later
     Then Monetary mass should be 90.00 ĞD