I lift 3 times per week, Wednesday, Friday, Sunday. I altenrate squats and deadlifts and it seems to be working out ok for me. So I have, what, 48 hours, between squats and deadlifts? Then 72 hours once per week. And if I do go too heavy with my squats one day, I will adjust the workout, but that usually happens with pullups and bench rather than squats or deadlifts for me.
The purpose of education is to free the student from the tyranny of the present. -Cicero