that they said you didn't need to wear a watch if..... . 请教你，短文最后一句that充当什么语法？

A Break inthe Routine
Jonathan Rivers lived alone in a neat,two-storey, semi-detached house in Compton Street. Like many bachelorsapproaching middle age, he was getting rather set in his ways. He caught thesame train to London every morning, ate his lunch in the same crowdedrestaurant near the office where he worked and always came home on the 6. 00train. People were so used to seeing Jonathan set off at a quarter past eight,dressed in a simple dark suit, wearing a black bowler hat and carrying a rolledumbrella on his arm, that they said you didn't need to wear a watch if youlived in Compton Street.

so...that 结构：如此。。。以至于。。。 这里that引导结果状语从句。
译文：人们如此习惯看到。。。，以至于你不必戴表。。。
希望可以帮到你！

充当的是连词，连接句子用的，没有实际含义。 再看看别人怎么说的。