Realistically speaking, a good few years, perhaps?
I'm optimistic that I'll get there if I continue putting the effort in and continuously improving my content. I mean, my videos in October are shocking compared to the delightfully mediocre work I'm putting out now, so who know what the future holds?
Education isn't a genre on YouTube that people will flock to watch en masse a la gaming and beauty, etc. However, it's still something that people will always need and refer to more than they probably realise. So, I hope that I can become a valuable reference to people - and most importantly, I don't plan on giving up any time soon - so maybe in a few years, I'll look back on this very post and smile to myself. Who knows, eh?