Long exposures with Nikon D5200?

I've been looking everywhere for an answer to this, but I can't find anything. Is it even possible to do long exposures with the D5200? And by long exposures, I mean 15-30 minutes-long. Is there a setting for it? I tried using the bulb mode with my remote (wr-r10/wr-t10), but the shutter still closes after only 60 seconds. So, if this is possible, please let me know how!

(Also, I have a D80 that I don't use much anymore. If it isn't possible to do very long exposures with the D5200, would it be possible with the D80?)

When taking long exposures, make sure that you have the "Long exposure NR" (noise reduction) feature set to on.

Usually if you press and hold a remote shutter release, the shutter will stay open as long as you have the remote shutter release depressed.

When shooting in low light, your meter will not be of much use, so you will have to do some tests.

Start with a rather large aperture, like f/5.6 and open the shutter for ten minutes. If the resulting image is nearly white, you will need to stop the lens down to around f/16. Do another test and see what kind of result you get.

Using these exposures as starting points, you can calculate the correct exposure of your subject.

If you the exposures are still overexposed, you may have to add a 10 stop and filter and do some more testing.

NOTE: If the cameras shutter still turns off before your exposure time is reached, that probably means that the sensor is getting hot and the camera is shutting off to protect the sensor from heat damage

Are you running in Manual mode. Must.

Yes, the D80 has a Bulb mode. See page 51 of your manual. If the manual is gone download one from Nikon.
https://support.nikonusa.com/...a_id/14051

It may be that the wireless remote won't work with long exposures in bulb mode so you would have to get a wired remote and you can have that open all night, within limits.

According to the post in the link, someone had bulb problems on a D800.

Also, if you have NR on you'll probably find that the exposure time is doubled since the camera takes another exposure with the shutter closed to get the background noise signature to subtract from the real exposure.

Take lots of batteries or external power supplies. Long exposures will eat batteries.

Use bulb mode.
The ML-L3 remote works with bulb mode.