Life span of muslim ummah and jews working more than muslims

The hadith in bukhari ‏ >Narrated Ibn `Umar: > > The Prophet (ﷺ) said, "Your example and the example of the people of the two Scriptures (i.e. Jews and Christians) is like the example of a man who employed some laborers and asked them, 'Who will work for me from morning till midday for one Qirat?' The Jews accepted and carried out the work. He then asked, Who will work for me from midday up to the Asr prayer for one Qirat?' The Christians accepted and fulfilled the work. He then said, 'Who will work for me from the Asr till sunset for two Qirats?' You, Muslims have accepted the offer. The Jews and the Christians got angry and said, 'Why should we work more and get lesser wages?' (Allah) said, 'Have I withheld part of your right?' They replied in the negative. He said, 'It is My Blessing, I bestow upon whomever I wish .' > >Sahih al-Bukhari 2268 The point is about the saying of people of the book that they worked more but got less wages. We know that jews worked for about 1700 years and christians for 600 years and the Muslim ummah is now in 1440s years. Wouldn't it mean that the muslim ummah can't be more than about 1700 years as jews worked more than that? And hence it that case it will be false for them to say we worked more? But christians saying we worked more doesn't make sense?