Sum column of alphanumeric values

[six6to8eight]

Hello,

The range L19:L65536 is filled with alphanumeric values in the format: "## days" or "### days"

Thus,
L19 = 75 days
L20 = 102 days
L21 = 64 days
L22 = 45 days
L23 = 135 days
etc. etc.

I'm looking for a formula that I can stick into a cell which will allow me to sum up the numeric values to get a total number of days. I've tried a few methods to parse the numbers out of the cells, but all to no avail. Any ideas?

Note: If necessary, I can create a Dynamic Named Range which contains only those cells with values (since I obviously don't have the cells in row L filled all the way to the very bottom).

Many thanks.