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Considering that ZilverK gains at least 20k a day, and Gura gained 10k every 4 days this month at the fastest, that would mean that he gets about 17.5k subs closer to her each day. Gura has a lead of 2.27 million, that means he would catch up in about 130 days (rounded up), or just about 4 1/3 months from now.
And that's without putting into consideration that Gura's growth had been slowing down as the month progressed, and that ZilverK has had many days where he has gained more than 20k a day. It's likely that he'll even pass her even sooner than that.