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The Eggtimer Apogee has a 60-second countdown timer from when you turn on the screw switch until it arms. This gives you time to remove and replace the nose cone after you turn on the screw switch... although we recommend putting an access hole for the screw switch through the airframe and nose cone shoulder so you don't have to remove the nose cone at all.
The problem with timers for apogee deployment is that they don't have any way of sensing apogee, so if you guess the time wrong it's still either going to fire short or long, just like a motor delay. Also, if something happens and you have an "event" (i.e. fins shreadding off), a timer isn't going to get the laundry out when you need it... but an apogee-sensing baro sensor will.
The problem with timers for apogee deployment is that they don't have any way of sensing apogee, so if you guess the time wrong it's still either going to fire short or long, just like a motor delay. Also, if something happens and you have an "event" (i.e. fins shreadding off), a timer isn't going to get the laundry out when you need it... but an apogee-sensing baro sensor will.