I did mine at 37 weeks at a home based place I go to regularly. It was always done under an hour plus but being heavily pregnant, I lied down sideways with my head straight throughout entire session as lying flat was uncomfortable.
U will need to look for a lash place that does extensions fast like mine. Not sure where ure staying so can’t exactly recommend but a really gd and reliable one is Dr Lash which I’ve also went to during my pregnancy in 2nd trimester. Thou it’s not cheap but quality good and lasting. Plus point is they have a few outlets.
Lusia Kastina