Protector Olympus Stylus

Protector Olympus Stylus
How many pictures a Olympus Stylus 8010 and a strong grip on the memory card 4 GB?

I ask because I'm about to buy this camera set at amazon.com http://www.amazon.com/Olympus-Digital-Complimentary-Accessory-protectors/dp/B0039PALKM

It depends on the resolution …. the better quality, 140 per GB. page 66 of manual. The 20TOUGH3000_6020_8010%% … http://resources.olympus-europa.com//consumer/catalogs/41256904005028C0D4F8782F523BC6D3C12576C70033247C_Mju 20en.pdf manual