We wish there was an easy answer but the response will vary based on many criteria. Every species of tree grows at different rates and has differing implications for how often it will need pruned. Among shade trees, there are trees that can need trimmed every other year. There are also ones that can go seven years or more between pruning. Evergreen trees most times will need little or very infrequent pruning if planted in the right location.
For some recommended best practices for tree pruning & trimming, check out our Guide to Pruning Trees.