Dependent on the Camellia type, trimming them now you may be removing the potential blooms this time of year, just food for thought. We have several that will bloom in November time frame on some of our properties. Other than that 8 hours of shrub trimming does not sound very realistic to me for the number of shrubs you have indicated.
10% of your customers are 90% of the problem.
You may think the grass is GREENER on the other side, but if you take the time to water your own grass would be just as GREEN[/COLOR].