According to me all normally sterile blood and body fluids must be incubated till 48 hours and all other samples, 24 hours is sufficient. If etiological agent is there it will grow within 24 hours.

It depends on the nature of bacteria and samples. Urines for 24 h, blood for 7 days, cerebronal fluid 24h,..

I too believe that all normally sterile blood and body fluids must be kept for 48 hours and especially blood for 5 days only but there is debate that all samples must be incubated till 48 hours