Not really; you can get people up to free-fall parachuting standard in a couple of weeks.
Static-line jumps are easy; the challenges are moving around the plane fully-loaded, and landing without breaking too many things.
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Any soldier can learn the basics of static-line jumping in one day. I have taught the one-day S/L course dozens of times for a total of hundreds of S/L or IAD students. Ground school can be taught in as little as 3 hours (with bright students). 99 percent jumped the same afternoon.
Mind you, they required close supervision. They exited one per pass with me closely supervising: a firm hand on their harness and leaning out close enough to kiss them! We tried to time exits so that only one student was in the air at a time.
Teaching troops to exit 30 per pass would take another week. Teaching them how to jump with rucksacks, rifles and snowshoes would take most of another week.
But learning S/L parachuting is the easy part.
Toughening up light infantry is the hard part. They need to learn how to carry and use a variety of radios, weapons, explosives, etc. All that light-weight, go-fast gear quickly adds up to 100 pound (40 kg) rucksacks, plus body armour, etc.
Then they have to learn how to swim and run marathons with all that gear. Finally, they need to learn to fight as teams to kill the enemy.
Training light infantry can take several years to slowly grow all the muscles, tendons, ligaments, lungs, etc.
Master Corporal (retired) Rob Warner CD, BA, Canadian Army Basic Paratrooper Wings, West German Army Bronze Paratrooper Wings, plus a long list of civilian skydiving ratings. Total more than 6,600 jumps.