You absolute gentleman, thanks very much for the help!
I'll try both of these solutions shortly.
After farrrr too long revisiting high-school maths, I came up with this ->
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math.floor((17.5*(1-exp(-time*0.2)))*100)/100
That reaches 17.5 from 0 with 2 decimal places, albeit with no smooth take off (need a bezier for this) but I can deal with it for now.
I use the number literally, in text, though as you've pointed out, I could animate something with it also - which I may well do, but elsewhere we can use splines and super handy curves for this - I needed to do this programmatically though and I can see loads of use cases for animating things based on an unknown clip-length for example - great for creating re-usable content which I'd like to do. The overhead of making a title per-video sucks at the moment.