I managed to have two cycles over a year and not tell work for similar reasons. My clinic was a long way from my office (1.5/2hrs).
It was hard!
However, there are certain parts that are trickier than others. There's the bit when you're stimming as you might need scans/bloods every day or every other day. These seem to have to be in the morning. We always went for the earliest appointment. My DH works closer to the clinic so actually he just about got in time. I found ways of juggling it so it wasn't so obvious.
On a couple of occasions, I said I had appointments for a blood test or whatever 'with my GP'. And these weren't questioned.
One time, I booked a block of leave for the stim part. But it's hard because you only know roughly when it will be in advance.
In my experience this was the most difficult time period to conceal from work as it's just so intense.
You'll need a day off for the egg collection as they sedate you. You won't know exactly what day it'll be until right before as depends on how your eggs are growing. But you'll know roughly. Hopefully if you took a chunk of leave, you could time it so it's part of it.
Embryo transfer is a really quick appointment. But it's really tricky to know when it will be as it depends how the embryos are growing and what day they put them back in on (e.g. day 3, 5, etc).
There are a few scans if you get a BFP but they can be any time of day.