I'm pretty new to SEO but i've learned alot. New guy at my job and all our customers already have SEO up and running, keywords are there, texts are optimized for keywords and so on. My boss wants me to "optimize" the sites for 8 hours a day, but there is only so much to optimize or am i missing something? I am new, yes but this optimization work where i fix a few errors on the site doesn't take me 8 hours, more like 1 hour a day for all our customers.

Help me out here, what more can i do or am i missing something??