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Had plenty of that over the years, sometimes one load would last you all day! To be fair the large tonnage jobs were often very well organized and there were usually spare machines on site to cover any breakdowns. However weather conditions were something you couldn’t do much about. I remember one saturday being one of several trucks involved in resurfacing the A500 ‘D’ road at Talke and there were several different gangs working on various parts of the road. ‘Our’ part was below the flyover where the A34 crossed and there was a belt of dense freezing fog that refused to lift until afternoon so the clerk of the works wouldn’t give permission to lay until the ground temperature was ok. Unbelieveably only a quarter mile up the road it was bright sunshine and trucks were passing us in droves to keep the gang on that section supplied with tarmac! 
Waiting time was signed with no problem but it made for a long saturday.
Pete.