how can we set a tasks minimum duration level ex day,hours
Currently there is no built-in options,
but you can control task duration as user changes it - you can add some kind of validation or auto-correction there
docs.dhtmlx.com/gantt/api__gantt … event.html
docs.dhtmlx.com/gantt/api__gantt … event.html
docs.dhtmlx.com/gantt/api__gantt … event.html