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@s.walrus
Each link is 1 inch and 2 teeth. So adding 2 teeth makes the rear sprocket 1 inch bigger in diameter, the chain wraps around roughly half the sprocket, so an extra 1/2 inch of chain will be used, since the chain is split 50:50 top to bottom (ish), you'll need to move the wheel in by 1/4 inch to get that spare 1/2 inch (1/4 from top, 1/4 from bottom).
So, what Moog said: 1/8 inch per extra cog. A 1 1/2 inch long track end will give you about 1 inch of freedom (not all of which might be usable as you are stuck with multiples of 1/2 inches (or 1/4 with a half link).
With two teeth you shouldn't have a problem.