Table:
text: State Duma (Russian Empire)
Seats held in Imperial Dumas
Seats held in Imperial Dumas
Party First_Duma Second_Duma Third_Duma Fourth_Duma_
Russian Social Democratic Party 18 (Mensheviks) 47 (Mensheviks) 19 (Bolsheviks) 15 (Bolsheviks)
Socialist-Revolutionary Party – 37 – –
Labour group 136 104 13 10
Progressist Party 27 28 28 41
Constitutional Democratic Party (Kadets) 179 92 52 57
Non-Russian National Groups 121 – 26 21
Centre Party – – – 33
Octobrist Party 17 42 154 95
Nationalists 60 93 26 22
Rightists 8 10 147 154

Question: How long did the First Duma last on Rigtists under the State Duma (Russian Empire)?