monthlong

adj

1. (not-comparable)Which lasts a month, or approximately so.

   “In early December, as rainwaters had started the monthlong process of flooding mines and washing out rail lines, workers lined up before 1 p.m. at an easy-to-miss storefront depot in Mackay.”

   “The 1.2-meter-diameter (4-foot-diameter) telescope has set off on a monthlong journey to its orbital destination of the sun-Earth Lagrange point L2, which is nearly 1 million miles (1.6 million kilometers) away from Earth and also home to NASA’s James Webb Space Telescope. Euclid will keep pace with Earth as our planet orbits the sun.”