The 4 months
When Lucas was looking at every single detail of his strengths through the system and the objectives.
He finally realized something.
'We have to get 5 levels of very skill till the time limit... which is 4 months... Fuck" Lucas sighed inwardly, he was on the night shift taking care of the others while they slept like a log.
At first, everyone had some small trouble sleeping in these unsafe situations. But with time, they started to loosen up thinking that they were actually protected while they were sleeping.
Lucas was tensed with this information that he just realized, he may have only needed to level his skills up to five but he was getting more and more skills as the days passed.
In the beginning, when he had only two skills, it would have been alright but now he had many, and getting all of them to level five would take all his attention.