<PRE><B>Question 1107620</B>
Possible choices for 4 letters is 26^4=456,976
for 8, it is 26^8=2 x 10^11
That ratio is 456976
time=k*combinations
6=k*456,976
k=6/456976=0.00001313

time for 24= 0.00001313* 2 x 10^11=2,741,899
That is closest to a month
30 days*86,40-0 seconds per day=2,592,000
C</PRE>