Extend Exposure

How come when I go to (extend exposure), it only allows me to go to frame 999 and not any higher? I have my scene length set up for about 2400 frames.

Thanks,
Jeramiah

I think it is because in general, the scene frames normally few seconds (hundreds of frames) unless special case. So it may have been set as 999 max. This should be changed in new version hopefully. The work around way is fist select the frame 2400 for example from Time Line and then use extend exposure (or F5 for shortcut) instead of using set exposure.