The reasoning
The photos set the length, the platform sets the ceiling
Every platform cap on this page is far longer than any listing video should be. TikTok takes an hour long upload. Facebook dropped its length limit when it turned every video into a reel. So the caps are not what decides the length. Two other things do.
The first is how much there is to show. A video is too long the moment it stops showing something new. A 600 sq ft studio condo in Chicago has maybe eight photos worth showing; stretch that to 45 seconds and each frame sits for five seconds while nothing happens. A $2.1M waterfront in Tampa with 35 strong photos has the opposite problem: at a calm luxury pace, a 45 second Reel holds about 12 of them, and the rest stay in the gallery.
The second is who is watching. On Reels, TikTok and Shorts the viewer did not ask for your listing, so the planner keeps those cuts under a minute, and usually well under. On the MLS, YouTube and your listing website the viewer clicked on purpose and is weighing the home, so it allows 45 seconds to 2 minutes and keeps more photos.
Where the numbers come from
The planner starts from a pace: about 2.6 seconds a photo for a typical home, 3.6 for luxury and land, 2 for a bold modern cut on the beat. It multiplies that by your photo count, adds a closing card (2 seconds on social, 4 on the long versions) and fits the result inside the platform’s range. If your photos run past the top of the range, it tells you how many to cut. If they cannot reach the bottom even when each shot is held as long as it can stand (about 4.5 seconds, 6 for slow luxury), it tells you to go shorter rather than pad.
The narration budget is 2.5 words a second of the final length. That is a comfortable voiceover pace with room to breathe, and it is a ceiling: a 30 second Reel holds about 75 words, and 60 good ones usually sound better. The script generator writes to the same budget, beat by beat.
One edit, cut several ways
You do not need a different video per platform, but you do need a different length and frame. Edit the long walkthrough first, for the website and MLS, then trim the same story down for the feeds: open on the hero shot, keep the rooms buyers ask about, drop the second bathroom. Square still has a place in email, even if it is fading on Instagram; 4:5 at 1080x1350 takes more of the screen in a Facebook or Instagram feed.
The ranges here match our longer write up, how long should a listing video be. For what to say once you know the length, see listing video script examples and scripts that sell homes, and the caption generator for the post itself.