six o'clock
Many other boys and girls wished a ride on the ice boat , and in the end Bert carried a dozen or more across the lake and back . It was rather hard work tacking against the wind , but the old sailor had taught him how it might be done , and he got along fairly well . When the ice boat got stuck all the boys and girls got off and helped push the craft along . `` It is ` most supper time , '' said Nan , as the whistle at the saw-mill blew for six o'clock . `` We 'll have to go home soon , Bert . '' `` Oh , let us take one more trip , '' pleaded her twin brother . The other boys and girls had gone and they were left alone .