Manual:$wgParserCacheAsyncExpireTime

Parser Cache: $wgParserCacheAsyncExpireTime
The expiry time for "not ready" asynchronous content in the parser cache, in seconds.
Introduced in version:1.44.0 (Gerrit change 1084879; git #df41aa3d)
Removed in version:Still in use
Allowed values:Unspecified
Default value:60 (1 minute)

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The expiry time for "not ready" asynchronous content in the parser cache, in seconds. This should be rather short, to allow the "not ready" content to be replaced by "ready" content.