There is no real answer to that. People can be in them for days or weeks or months or even years.
There are no refugee camps in Senegal. The "girl in the refugee camp" is a scam that has been going on for a long, long time. The scam attempts to get banking details from gullible victims. Ignore the message, delete it.
Souf refugee camp was created in 1967.
Shatila refugee camp was created in 1949.
Marka refugee camp was created in 1968.
Refugee Camp All-Stars was created in 1997.
Refugee Camp All-Stars ended in 1997.
Mieh Mieh refugee camp was created in 1954.
Mae La refugee camp's population is 30,000.
The population of Nong Samet Refugee Camp is 70,000.
Nong Samet Refugee Camp's population is 45,000.
Sa Kaeo Refugee Camp was created in 1979.
Nong Chan Refugee Camp was created in 1979.