Depends a lot from variety to variety. Eleagnus you can figure on pruning 5-6 times a year. Something like Yaupon Holly much less. Say once or twice at the most. There are growth regulators on the market that will reduce the frequency of pruning, but it is expensive.
It all depends on the type, but have you thought about a growth inhibitor? After trimming shrubs at the apartment complexes,and restaurants we apply the growth inhibitor to slow grow. This buyes us time and saves labor cost.
Damn!!!! 4 to 5 cuts, make me glad I live in the midwest. We prune everything by hand with Felcos ONCE! Taxus, Ilex, EAC, you name it. I must admit that there are a few instances where we go back in and do a light touch up. If you time your pruning properly you may be able to reduce the frequency.