I have to install a new liner in my 18'x52" AG. Is it safe to leave the walls standing without the liner for a few days? With my work schedule I only have a couple hours in the evening to work on our pool. I need to drain the pool, remove the old liner, repair some mole damage to the sand around the border, then install the new liner. If the pool is without the liner for maybe a week and I install a few supports will it be alright or do I need to get everything done ASAP?