hmmm... 5 accounts, 62 characters. interesting problem.

thinking out loud here:
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first issue... you have 5 accounts, but a max of 10 toons per server. i'd consider 6 toons per account per server on 2 servers. this will give 60 characters... add 1 character per server to get 31 (death knight)

next, don't go above 60 while RAF is still active. you'd just be wasting your precious RAF time.

the best i have heard for a /played from 1-60 was about 24 hours and 1-30 in 12 hours.

assuming chained accounts, A -> B -> C -> D -> E, i'd take the first group to 60 quick, with some basic professions (enchanting for sure)
created: A1(60), B1(60), C1(60), D1(60), E1(60)
grantables: A1(0), B1(30), C1(30), D1(30), E1(30)
/played: 24 hours (some professions allowed)
total created: 5 * 60
total played: 24 hrs

2nd set: level to 30... granting them to 60 once done.
created: A2(60), B2(60), C2(60), D2(60), E2(30)
grantables: A2(0), B2(30), C2(30), D2(30), E2(15)
/played: 12 hrs (in the rhythm now)
total created: 9 * 60 + 1 * 30
total played: 36 hrs

3rd set: level to 30... use all grantables from the 2nd set
created: A3(60), B3(60), C3(60), D3(45), E3(30)
grantables: A3(0), B3(30), C3(30), D3(22), E3(15)
/played: 12 hrs
total created: 12 * 60 + 1 * 45 + 2 * 30
total played: 48 hrs

4th set: level to 30... use all grantables from the 3rd set
created: A4(60), B4(60), C4(52), D4(45), E4(30)
grantables: A4(0), B4(30), C4(26), D4(22), E4(15)
/played: 12 hrs
total created: 14 * 60 + 1 * 52 + 2 * 45 + 3 * 30
total played: 60 hrs

5th set: level to 30... use all grantables from the 4th set
created: A5(60), B5( 56 ), C5(52), D5(45), E5(30)
grantables: A5(0), B5(28), C5(26), D5(22), E5(15)
/played: 12 hrs
total created: 15 * 60 + 1 * 56 + 2 * 52 + 3 * 45 + 4 * 30
total played: 72 hrs

6th set: level to 32... use all grantables from the 5th set
created: A6(60), B6(58 ), C6(54), D6(47), E6(32)
grantables: A6(0), B6(29), C6(27), D6(23), E6(16)
/played: 12 hrs
total created: 16 * 60 + 1 * 58 + 1 * 56 + 1 * 54 + 2 * 52 + 1 * 47 + 3 * 45 + 1 * 32 + 4 * 30 ... 31 characters
total played: 84 hrs

the accounts (server 1):
A: 60, 60, 60, 60, 60, 60
B: 60, 60, 60, 60, 56, 58
C: 60, 60, 60, 52, 52, 54
D: 60, 60, 45, 45, 45, 47
E: 60, 30, 30, 30, 30, 32

as i understand it, you can boost... but it has to be from an unlinked account. so... using account A, i would boost the remainders:

boosting (use any character from account A that would be good for boosting):
set: A1, E2, D3, C4 ... leaving B off on purpose

as each character gets to 60, swap them out for the next on the account that needs levels
once completed, use C6 to grant B5 and B6 to 60

time estimate... since we are boosting from 30 to 60 on E, the time would be 5 * 1 boost from 30 to 60. est: 8 hrs per boost... 40 hrs

total time: 124 hrs played (add <1 day for the final character ... make it a deathknight starting @ 55)
result: 31 characters

repeat for the second server.

so you could have 62 characters this way with about 248 hrs /played, or less then 11 days
assuming an average of 8 hours per day, this would take about 31 days straight to get 62 * 60.

60 to 70... i'm hearing it would take 4 hrs per level, so another 40 hrs per crew... 10 crews, 400 hrs /played

70 to 80, i'm hearing about 12 hours per level. 120 hours per crew, 1200 hours /played for 10 crews

END RESULT:
62 characters in a best time of 1,848 hrs /played, or about 77 days

assuming 8 hours average played per day, it would take 231 days... or 33 weeks... ~8 months

if you want to make it by Christmas... assuming 220 days until Christmas... you would have to average about 8.4 hrs /played per night.
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sounds do-able... and strangely enough... i'm reminded of south park