After a special medicine is introduced into a petri dish full of bacteria, the number of bacteria remaining in the dish decreases rapidly.
The relationship between the elapsed time t, in seconds, and the number of bacteria, N(t), in the petri dish is modeled by the following function:
N(t)=1000⋅(12)^t/5.5
Complete the following sentence about the half-life of the bacteria culture.
The number of bacteria is halved every ___ seconds.