I quote Colin from another thread
"Most cameras can only automatically shoot a maximum of a 30 second exposure. To go longer, you need to use bulb mode - and using bulb mode typically requires a remote release (to avoid moving the camera when holding the shutter release open)"
There seems to be no technical reason for camera manufactures not to allow or provide an option for the user to set a time longer then 30 seconds. I know it will usually mean you are taking an exposure beyond the metering capability of the camera but so what.
There has been a number of times when I have wanted to take a 1 to 5 minute exposure and been using a camera with a built in clock and timers and no way to utilise them. Even my low tech domestic oven has a timer. Last time it happened I was in a cave and wanted to set a 90 sec exposure and light paint the cave using my torch. I would love an option in the menu to set a "bulb" time. I do not really care what they call the function and I am perfectly happy for it to not be linked to any exposure evaluation functions of the camera. Why make me use a remote timer/release when the technology is in my hands (well sitting on the tripod).