"Reading time" should use the pre-defined metadata fields for this, when available

[jmacdotorg]

Plerd posts compute their own estimated reading time, and they also can generate metadata tags for use by e.g. Twitter Cards. Some of these metadata display services -- Twitter Cards included -- either do have specific "reading time" fields, or user-definable fields which can be used for this purpose.

Plerd posts should be able to make use of these fields for reading time, when they are available.