Aisle runner

The aisle length at daughter's venue was 50' and her 100 guests had plenty of room -- the venue could have seated 220 in the same space (wedding was pre-Covid). With a guest list of 50, I'd guess the 25' runner is likely plenty long enough for the space those guests will need (that would be four rows of six on each side of the aisle, and only take up 18' from front to back). I'm assuming that the message is spread out to cover the length of the runner? If so, I don't think you want the runner too long or the message is going to be spread out pretty far behind the guests (something I'd think about is how it will photograph -- how far back with your photographer need to stand so the message makes sense in the photos). I agree with pp to think about/talk with your venue about the best length and how the runner might be affixed so that it doesn't wrinkle or blow around. Daughter's venue supplied a heavy paper/fabric disposable runner and their practice was to tape it down to the concrete ceremony area using double sided tape under both long edges. Without that, it would have been blown around by the gentle breeze and/or been wrinkled or dragged as the wedding party walked on it.