We highly recommend you give 1 week minimum (but longer is better), lead-time to give the editorial teams a chance to see your release and consider it for featuring.
Although we can deliver and make releases live on Spotify, iTunes, etc within 6-48 hours, we highly recommend you give 1 week minimum lead-time to give the editorial teams a chance to see your release and consider it for featuring. Spotify has a 1 week minimum lead-time for playlist submission and Release Radar inclusion. You can read more about Spotify's recommendations on Spotify for Artists.
Other retailers, such as Beatport, Juno, and others may require 3-5 days to process uploads and make your release live, so please keep that in mind when planning your release schedule.
Also keep in mind, that many DSP's like Beatport, iTunes, and Spotify have cut-off periods during holiday seasons, during which time they have limited resources or are not accepting any uploads during that time. You can still schedule your releases to come out during those times, but there may be a delay in processing any new uploads or updates. Some of them may be out of the office entirely and will not be around to make changes or process new uploads. Therefore, it is important to plan your release schedule accordingly.