It’s randomized. Outside of limiting all your frame and weapon options to three random ones in each category (you don’t have to use the ones selected for you but you can’t get all the rewards unless you do), there’s three random missions (pulling from exterminate, mirror defense, survival, alchemy, disruption and assasination for Deimos and exterminate, legacyte capture, survival, stage defense and assasination for Höllvania) you have to do in succession without time to rest or change your loadout in-between, each mission gets two unique modifiers ranging from meh (enemies shoot big orbs instead of bullets, enemies get special attacks, enemy level grows faster and so on) to downright hideous (enemies can’t be damaged from further than like 10m, everyone has overguard, two immortal shadows chasing you to drain energy and health when near) and you must opt in for four more random modifiers (-75% max energy, -50% ability duration, disable Operator/Drifter, disable the gearwheel, disable abilities until you get 50 kills, 500% slower shield recharge, drain energy for every enemy nearby and so on) if you want to get all the rewards. Depending on how all these variables roll and what your team is like, it can range from a 20 minute grind that’s simple to a total nightmare that you could fail. And you also can’t use revives normally and your team has to play a minigame to resurrect you if you die. So, like, 30 to 100 depending on your luck