Happy Birthday, Votart (too late, but something:)
You can raise (or show exact) your score at any time I think. We don't have strict rules.
If I was you - "common sence" tells me that 30hours til the end is normal time to show real score (+-20$), but when I'm revealing my real score - it gives information to others, using which they beat me
Feel the Power of the Dark Side.