About 1700 hours. Interestingly, the cylinder that failed was a replacement for a previous cylinder failure, a few years ago.
India Four Two, the fact that the same cylinder failed is not too surprising. This is likely to be the one which sees the most stress-causing conditions in operation.
Airflow through a cowl is not always front to rear or symmetrical, throughout the flight cycle.
An engine running on the ground could well have the air coming out the front of the cowl, whilst when the throttle is closed in flight it will generally flow through front to back due to the slipstream.