HI, I stated a bad habit for my girls! My not yet laying pullets were roosting right on the perch to the nest boxes since I didn't know this was a problem until reading more about it, so last week I blocked them off and built two other higher perches for them to roost on. Does anyone know how long I need to block them off for this new perching/behavior to set in? They are about 6.5 months old, so I don't want to block them off too long as I don't want them to start laying somewhere else, but I also don't want really dirty eggs. Thanks.