This is not bidah......... even sahaba spent 4 months some sahaba spent years 2 years even one sahabi spent 27 years so this is not Bida'h even 1 sahabiya asked hazrat Ayesha RA how much is the minimum time to spent in path of Allah for our Husband's Hazrat Ayesha RA Replied 4 months is the minimum time ( Ref :- Hayatussahab )