Just to share what I found while playing, and for my own reference.
Criminal 
 Max strength (50en)= 33 (5 days) Max charisma (30en) = 15 (6 2/3 days) Max knowledge
 (from surfing the web, 10en) = 6 (5 days),
 (from studying 50en) = 17 (9 days) Days to max 300 (assuming that 27 points was not given) =
 16 2/3 days (surfing),
 20 2/3 (studying)
Playful  Max strength (50en)= 24 (6 1/2 days) Max charisma (30en)= 20 (5 days) Max knowledge
 (from surfing the web, 10en) = 6 (5 days),
 (from studying, 50en) = 17 (9 days) Days to max 300 (assuming that 27 points was not given) =
 16 1/2 days(surfing),
 20 1/2 (studying)
Intelligent  Max strength (50en)= 24 (6 1/2 days) Max charm (30en)= 15 (6 2/3 days) Max knowledge
 (from surfing the web, 10en) = 6 (5 days),
 (from studying, 50en) = 33 (5 days)Days to max 300 (assuming that 27 points was not given) =
 18~19 days (surfing),
 18-19 days (studying)