monthlong

From month + -long.

monthlong (not comparable)

1. Which lasts a month, or approximately so.
   • 2011 January 12, Joel Kirkland, “Australia's Record Rains Squeeze World Coal Supplies as Scientists Study Climate Pattern”, in The New York Times‎^[1], archived from the original on 15 September 2025:

     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.

   • 2021 December 24, Don Lincoln, “The telescope that will replace Hubble will launch on Christmas. Here’s why it matters”, in CNN‎^[2]:

     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.