3 days after the start of Ramesses XI's 29th regnal year, which would (on the assumption that the years of the Whm Mswt fully coincided with the original regnal years of Ramesses XI) prove that the Whm Mswt reached into a year 11.
Three days after the beginning of Ramesses XI's 29th year as pharaoh, which would be consistent with the assumption that the years of the Whm Mswt align perfectly with Ramesses XI's regnal years, proves that the Whm Mswt reached a year 11.