Truncate long messages setting in Fedilab it's set to 10
https://equestria.social/system/media_attachments/files/109/619/214/398/624/621/original/4660e896b0411ec2.jpeg
For those who don't like the giant messages #fedilab has the setting for you
The setting Truncate long messages under timeline makes it so that as soon as a message has more than the specified amount of lines it will display a show more button
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