We revisit the fizzy drink going flat (this time it’s champagne to celebrate week 9!!).  The saturation-growth model fitted to the data from photos taken every two hours (like with the coke example last week) is shown in figure 2 at below and the equation for the fitted function (circled in the figure) is repeated below:

When does the cumulative total of observed bubbles reach 1000?

Answer to one decimal place.