I am facing a strange problem. I had my new D90 a few months back. Since then I've gone through each and every menu options and changed them according to my convenience. I have also gone through the manual to know what every menu option does. After some time I wished to shoot start trails. I bought a remote release and tripod. But the problem is that my camera does not allow long exposures in bulb mode more than 30 minutes. It automatically closes shutter after 30 minutes when I have triggered the camera with remote release in Bulb mode. Now I remember changing some settings in the camera not to allow long exposures past 30 minutes assuming such long exposures won't be required. But I don't remember where that option is. I browsed through all the menu options, searched through the entire manual, but could not find that. Can anyone help to restore that setting? P.S. I tried doing 'Reset all custom settings', but it did not help.