I’m burying what I believe to be the answer at the end after the explanation, feel free to jump to it.
I don’t have a D5200 but I do have a D7200, so using that and some research this is what I have.
“David Busch’s” Nikon D7200 Guide … says on page 184:
“There are three common types of lengthy exposures: timed exposures,
bulb exposures, and time exposures. The D7200 offers only the first
two (although time exposures are possible with certain remote
I’m not sure whether this was a mistake or was true at the time but has changed due to firmware updates. In any case, my D7200 with the latest firmware does have all three.
My D7200 will go to Bulb while set to Quick Response, however going past Bulb brings me to Time.
In retrospect, Bulb makes no sense for an IR remote control (I used a KT-ML-L3 compatible) because Bulb nominally holds the shutter open until released and the remote simply sends an IR control pulse when pressed. In fact, putting my D7200 in Bulb and triggering the remote simply takes an exposure which is not what you normally want.
Moving the shutter setting beyond Bulb brings me to Time. It shows as Time in Live View and just – – (dash dash) in the view finder.
The Time setting works as you would expect to provide a Bulb-equivalent with the IR Remote, one IR button to start the exposure and a second one to stop the exposure. (Or three presses if the mirror up option is used.)
My Guess is that on your camera, Nikon eliminated the pointless and confusing Bulb selection for IR mode and went directly to the correct Time setting.
So Time is correct, forget Bulb.
In order for the IR to work it has to be set on in the menu. On my D7200 the menu is “Camera Symbol“ – Remote Control mode (ML-L3) – Quick-response remote (or Remote mirror-up, or 2 second delay). Note that Remote Control mode will toggle off if you turn off the camera and it will also time itself off if not used for a while.
Last but not least, make sure you IR remote is working! You stated that you hadn’t used the remote in a while, perhaps the battery is dead? Take your Smart Phone (it’s interesting that we now just assume everyone has one) and put it in camera mode. Point your remote at your smart phone camera and toggle the remote button. Do you see the remote LED lighting up in the phone display when you press the remote button? If not, you probably need a new battery for the remote.
As an aside, while the phone camera incorporates an IR filter, it is
not perfect. The intensity of the remote LED at close range is enough
to drive through the IR filter and be seen on the display. You can use
the same method to look for night time IR security systems.