# How fast does atmospheric carbon dioxide dissolve into strongly basic solution?

I'm conducting some pH measurements with solutions containing NaOH and I'm a bit concerned that carbon dioxide will dissolve and affect my measurements by lowering the pH according to the reaction: $$\ce{2 OH- + H2CO3 -> 2 H2O + CO3^2-}$$ This would consume my $\ce{OH-}$ ions; I obviously don't want that kind of interference.

Are the kinetics such that I should cover my setup, or can I ignore it's effect on a, say ~1 h timescale? Or ~24 h?