Order stacking time you require and then the remainder off load can be tipped off or:
if you would like us to stack the entire job please put this in the notes on your order with you best estimate of the time that you think stacking will take. 
We normally time the first stacking job so should customer require the service again we should know how long job will take next time!  Every delivery address is different so it is impossible to give definitive time until a job has been completed.