It would be a great help if you could export all your flights and then gather the times externally. The export function has been required for years - but is not yet implemented. I could program a crawler that collects data via the web interface - but I'm not allowed to.
It is only a workaround but you can export the flightplans to Excel - you will know this and yes, an export function would be so great to have. For rescheduling the Excel flightplan is quite good, but if you have to replace planes with faster planes, then the whole procedure is a nightmare of course if slots are rare.