Discovered!
Time passed swiftly. Leon granted the rebels the help of his summons, which greatly sped up the construction of the new airships. Not only did he make his lower rank summons come out, but even some random A rank summons were brought forward. With their strength, they were able to get so much more done.
By the time the two month timeframe was nearing its end, the sky of the hidden dimension where construction was done had become filled with many different airships of different sizes.
Leon had also counted the time, and was had paused in his efforts to have a moment to himself. After all, it had been just a bit over a year since he had arrived in this world. Time flew by quickly and he had almost lost his sense of time. He could not even remember the exact day he had come here, but he knew roughly how much time had passed.