The longest mission which these Salyuts supported was 63 days. The second generation Salyuts would fly missions much longer and would need to be resupplied from time to time; therefore, a supply ferry was mandatory to maintain a fully operational Salyut for two years with 40,000 pounds of fuel, food, clothing and water.
the longest mission which these salyuts supported was 63 days the second generation salyuts would fly missions much longer and would need to be resupplied from time to time therefore a supply ferry was mandatory to maintain a fully operational salyut for two years with 40 000 pounds of fuel food clothing and water