 It is undesirable because it puts owners too much at the mercy of their charterers, who can happily drain the last drop and more of profit at a time of raised market rates, taking the risk of late redelivery, knowing that they will never have to pay their owners more than the current market rate for the overrun period, a rate which will never in truth properly reflect the value to the charterers of being able to fit in another spot voyage at the last moment.It is uncommercial because, if it is demanded that the charterers need to know more than they already do in the ordinary course of events, when they already know that a new fixture, in all probability fixed at or around the time of redelivery, will follow on their own charter, then the demand is for something that cannot be provided.All that an owner will be able to tell his charterer in most cases is that he plans to fix his vessel anew at the time of redelivery.