>6-month lockup to keep everyone from cashing out on IPO day

This is a bit off-topic, but something I've always wondered. What if the lockup period was staggered per-employee across those 6 months? i.e. say you have a 180-day lockup, and 900 employees. On day 1, the 5 longest-tenured employees can sell. On day 2, the next 5, etc, and on day 180, the last 5. This avoids the IPO crash on day 1, and also avoids a crash 6 months later. Would something this be feasible?