Dertiming Maximum count of "1" in a frequency across rows

I am attempting to quickly determine the number of days a person works in a row. Column headings are each day of the year. Row C contains all the employees. If the employee is working on a day - then "1" is inserted into the cell that corresponds with that day. If he's off - the word "Off" will be in those cells. At the end of the spreadsheet - last column after Dec 31st , I am trying to put a formula in to count the maximum string of days worked in a row. The employee is not allowed to work past 24 so I need a flag when this happens. My formula that I'm using is counting both text and the numbers, but I only want it to count the number "1" and ignore anything else, both blank and text.
My formula is and array and is:
=MAX(FREQUENCY(IF(H9:NH9>=1,COLUMN(H9:NH9)),IF(H9:NH9<1,COLUMN(H9:NH9))))

Yes - it's not that simple. He could work from Jan 1st to 23rd then be off for 5 days. Then work for 20 days and off for 12 and then work for 25 days. I only want to see the maximum count of one continuous work stint. So the 25 days would be what I want returned as the answer to the formula. This formula worked for me when it was either a "1" or a blank cell, but now that there is text in some cells - it seems to be counting the text.

Perfect - that worked. Thank you!!