According to an unnamed “South Korean military source,” it takes a little while to fuel the Unha-2.

SEOUL (AFP) — North Korea is expected to set up its highly contentious rocket on the launch pad this weekend ahead of its expected firing in early April, a report said Wednesday.

[snip]

“It is highly likely that the rocket will emerge between March 28-31,” a South Korean military source told Yonhap news agency, adding it would take about three days to inject sufficient fuel.

Assuming that’s right, North Korea’s sorta-ICBM just doesn’t seem that threatening, does it?