Will your filter/pump be operating at least part of the day in your absence? If so, a higher level of chlorine should be fine. How much chlorine does your pool consume in a week? Example: Suppose that before you leave your normal tested Free Chlorine (FC) is within a normal range (2 -8 ppm) and your weekly loss rate is about 5 ppm, then you might consider adding sufficient chlorine to boost it (from, say, 2 to 12 ppm -or- 5 to 15 ppm.) This presumes that you normally add liquid chlorine to sanitize your pool. A somewhat different approach would be required if you rely upon pucks, tabs or granular chlorine sources. For more specific answer, post current full test results and your estimate for weekly or daily chlorine loss.