Here's how: 1  Stand with your feet shoulder-width apart and knees bent slightly. 2  Lean forward, placing your hands just above your knees. 3  Round your back so that your chest is closed and your shoulders are curved forward.  Then arch your back so that your chest opens and your shoulders roll 1  back. Repeat several times.
Typically this count is between 100,000 and 300,000 shutter actuations, with the latter limit associated with the EOS-1D models. In fact, the Camera Shutter Life Expectancy Database is a really neat user-based site for DSLR models of several brands, including Canon.
Numerically, 30 seconds is a larger number than, say, 1/125 of a second, but it's not a faster shutter speed. So, while shutter speed is not an inverse square relationship (like light intensity), it's still an inverse (first power) relationship: The smaller the fraction, the faster (higher) the speed.