The slings can be safely worn all day. While most people report immediate and complete relief from the pain of sitting slouched, you can realistically expect the benefits to continue as long as you wear the sling. And when you stand up or walk after using the Nada-Chair, it is not uncommon to feel a "halo effect" of well being and good posture for sometime thereafter. As with any new product, you may need to experiment and make fitting adjustments to optimize the longest, most comfortable sitting period. Because you will be able to sit for much longer periods more comfortably, we recommended that you take sensible breaks to stand, stretch, walk and breathe deeply at least once each hour.