would you suggest me how I could play around with settings for cache expiration using W3 Total Cache. I installed and in paralell configured with memchached to speed up the website. Given combination works fine as long as I visit the website like its home and its internal ealier opened pages. However, should I not visit the website for more then one hours the page starts loading fo a long again. I guess, the point is a duration of caching. Would you know how I could affect it and increase its presence till, lets say, one day ..