Acceleration without gravity

It works, but it only records for 2s ( or 5 second as code says so). I need to record 30min. What if I increase sample size, like 1800 * Hz. Will my watch burn or something else? Is 256 kB ram enough?
Other option is to modify "Acceleration Logger" app and change setPollInterval to lower value. Maybe like 10 ms. Documentation mentions "max value" for this but not a minimum :D