Concrete block molds could last approximately 80000-10000 cycles, however, this totally depends on:
Raw material:
If raw material used are gentle to the mould( i.e. round river sand and pebbles such as round stones). Mould lifespan will increase, crush granite/stone with hard edges will cause abrasion to the mould, thereby decreasing its lifespan, hard raw material will also decrease its lifespan.
Vibration time & pressure:
Some products require a higher vibration time( to achieve higher strength of products) an increase of vibration time increase the abrasion to the moulds causing the decrease in its lifespan.
Precision:
Some products required high precision (i.e. pavers) thereby the mould might not be useable within a short period of time. However if precision of products are not important(i.e. hollow block), a deviation of 2 mm on the moulds will still enable the mould to be usable.