[Sun Care] My La Roche-Posay sunscreen says it needs to be reapplied every two hours. Really? Should I switch to something longer lasting?

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I've been using La Roche-Posay Anthelios Mineral 50 for a couple years now. Other than having a whitish cast that has to be covered with makeup, I'm happy with it. However, I just noticed the instructions on the package advise reapplying at least every two hours. I'm not sure how this would even be possible for most people. I usually apply at the end of my morning routine, let it set, apply makeup on top, and that's it for the day unless I exercise or shower. Who in the hell could possibly reapply sunscreen that often!?Anyone know if it really needs to be reapplied that much? Are other sunscreens longer lasting? Now I'm worried that I've been wasting my time and money on something that hasn't even been effective.Instructions on bottle: http://i.imgur.com/pAyu4lc.jpg
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Submitted by 10thMuse