I just arrange it so I reply to one or two games a night, and since I do Advanced, they're moving along at a slow but steady pace. Not replying for a few days usually is perfectly fine.

I notice your name in the Free section a lot when I click on the home page. Maybe join fewer RPs and try a few Casual ones with relaxed expectations? If you're a member of several speed posting RP with dozens of posts a night, you're not going to have any free time that isn't roleplaying.