Need to factor in walking to the bus stop, waiting, going to sunny bay, 20 min bus ride, walk 2 min to MTR, wait up to 6 minutes for a train, then to tsing yi, escalators, walking, waiting for minibus, then off to GC.
That doesn't factor in full buses, you have two of them, very possible, and tuen mun road traffic, if any.
And GC to tsing yi in the morning must be a headache. I've driven couple weeks to tsing yi station and took the airport express into town. In the end wasn't worth it. Only get to relax 10 minutes on the train.
It is easy to say you can do work and emails on public transit but I find by the time I sit down and relax, I can't be bothered to do so on most days. Some days can but it isn't great productivity like some people make it out to be.
I factor in walking when I calculate my commute time too.