How many total pages to return. If $1redirect is enabled, the limit applies to each level separately (which means up to 2 * $1limit results may be returned).
MediaWiki:Apihelp-query+imageusage-param-limit
From Froggitt
How many total pages to return. If $1redirect is enabled, the limit applies to each level separately (which means up to 2 * $1limit results may be returned).
