Is there any character limit or even suggested character limit for using Schema.orgs description property? For example, in Microdata: itemprop=description The Schema.org website reads, A short description of the item., but doesnt specify what it considers short.
How long should a Schema.org description be?
microdata;schema.org
There is no character cap on the usage of itemprop description. The whole point of Schema is to provide correct additional information. By introducing a cap they would be defeating this objective. What they recommend is merely a recommedation  and in otherwords they are informing you not to use words that don't describe what the item is about.For example:If you have an article about Car Manufacturing in 1990, talks about the company ford and the inventor then your description should be something like:A in depth look at Ford Car Manufacturing in the 1990s and the inventor William fordA bad description would be something likeFord was known for manufacturing the best cars in the 1990's, find out about how William ford made the best carsLarge sentences generally have lots of , and . ideally you should only ever have one full stop and if possible avoid commas and then you can't go wrong. 