Is it true it takes longer to conceive baby number 2?

"After one month of trying I became pregnant and had a beautiful healthy boy!"

"After over 7 years of trying to conceive and thousands of dollars spent on infertility treatments, I had actually succeeded to get pregnant the natural way without any drugs or medical intervention "

" I just wanted to say thank you for writing this program and for giving hope to women at my age. I am 46 and I am finally going to be a mother."
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I just been to see my doctor who advised me that it can take up to 2 years to conceive your second child?
Is this true? i heard that if nothing happens within a year, then doctors look into it for you but i’ve never heard of 2 years?
She was kind enough to check my blood to check that i am ovulating and also a scan to check tubes.

when i went to ttc with my second it took me 2 years and with ttc with my 3rd it took me 2 years aswell