If a total of eight toll gates are available for the Eastbound direction and seven of them are configured as MTBs in $2019,$ roughly from which hour to which hour vehicles need to wait in a queue for toll collection? What is the total delay in vehicle$-$hours per day? If each MTB has a storage space for at most $50$ vehicles, at most how many seconds can be spent for each toll collection in average to avoid vehicle queues from exceeding the storage limit$?$