Hedges come in all shapes and sizes. When new and young formative pruning is best carried out in Spring and Winter each year. Once the general shape is established trimming once a year is usually sufficient.
Hedges can be reduced in width and height as required as some heavy work is sometimes needed to bring a hedge back to a manageable size that can be easily maintained without professional help.
If hedges are to maintain their looks, provide the desired service and not become unsightly liabilities