There is one Dutch study that said the longer it took to conceive, the more boys were conceived.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1315646/
I conceived my daughter first month trying and the longest I've ever taken to conceive was two months, but statistically it's likely there were both boys and girls in that mix.
ETA: Anecdotally, only 1 of the people I know who were diagnosed with infertiliy in my life had a girl. Everyone else had boys -- and for many of them (an in law, my therapist, a few friends, etc.) took more than 2 years. Others were the standard one year.