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[i]If the mission was scrubbed after the countdown had reached T-6 hours, the minimum time to recycle was in excess of 24 hours, and was as long as 40 hours at T=0. Thus, a minimum launch window required to guarantee a recycle capability is 3 days. This did not allow any additional time for repairs or replacing components. If this activity could not be carried out in parallel with the recycling, 3 days would not be sufficient. Therefore, a window of only 3 days duration was not desirable, but was considered a workable minimum in some situations. In order to provide time for repairs to be carried out and still make the monthly launch window, it had to be as long as possible. Another Bellcomm Labs study from the mid 1960's, indicated that the probability of a successful launch was between 85% and 90% if a 3 day launch window was available, and that this probability increases to about 95% if the launch window is of 5 days duration. [b]Based on this data, the early lunar landing missions were planned only for those periods when at least a 3 day launch window existed, and every effort was made to provide a 5 day launch window.[/b][/i]
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