Use the adverb "soon" to describe a short period of time in the future. The length of the period of time depends on the situation. "Soon" could be a few minutes into the future or several years into the future.
The movie begins soon. (This could be five minutes later.)
I’ll see you soon. (This could be an hour later or a few days later.)
Let’s get together soon. (This could be a few weeks from now–or never. Sometimes people say this to each other as they say goodbye without ever intending to see each other again.)
Let’s do this again soon. (The event was fun. The next time could be any time in the future.)
The house will be finished soon. (This could be two months later.)
The kids will be leaving for college soon. (This could be one or two years later. A lot of preparation is necessary.)
Soon, Grace will be retiring. (This could be three or four years later.)