A whole one year
3-6 years
they stay with there mum for up 2 to3 week and they go .
Because they live out their lives in groups, or pods, a calf would stay near its mother until one of them passes away.
Young dolphins stay with their mother until they are five to six years old.
for about 6 months
Around a year
the baby dolphin nurses from its mother for up to 8 months
Depends on the breed. Killer whales are 15-18 months, short beaked common 10-11 months, striped dolphin 12 months, spinner 10 months.
20 minutes
A mother dolphin stays pregnant for about 12 months.
If you mean how long can dolphin stay under water, it's about 20 minutes for a common bottlenose dolphin. I am not sure about other species of dolphins.
how long do baby mandrills stay with their mother