Yes — the usual solution is to skip the camera’s built-in timelapse mode and use an external intervalometer/cable release.

An external intervalometer can trigger a series of exposures using either normal shutter speeds or Bulb mode. In Bulb mode, the intervalometer effectively holds the shutter open for the duration you set, which is useful for the longer exposures often needed for Milky Way photography.

One important detail: on external intervalometers, the interval is typically the wait time after one exposure ends before the next begins. So if you set a 15-second Bulb exposure and a 5-second interval, each frame starts every 20 seconds.

This approach gives you much more control than the in-camera timelapse feature, and the main practical limit becomes your SD card capacity. If you buy an intervalometer, make sure it uses the correct connector for your camera; some third-party models work across multiple cameras if the plug matches.