On the first day of spring, an entire field of flowering trees blossoms. The population of locusts consuming these flowers rapidly increases as the trees blossom.

The relationship between the elapsed time t, in days, since the beginning of spring, and the number of locusts, L(t),is modeled by the following function: L(t)=750(53)^t/5.9

Complete the following sentence about the rate of change in the locust population.

The population of locusts gains2/3, of its size every ___ days.