I can't zoom that very well to read, but seems fairly readonable from what my eyesight can make out. 4-5h chunvks I think?
I find these sleep charts quite accurate:
www.mybabysleepguide.com/2013/02/average-sleep-charts-by-age.html?m=1
It's not within the spectrum of normal or ok to be waking hourly, all night, every night, for a prolonged period with a 6mobth old. In fact with any age. I'm sorry. I know how hard this kind of thing is to accept when you are going through it.
But it is not something you should endure because someone told you their baby did it too.
Nights of hourly wake ups happen, oh yes. For many months to come. Illness, pain, all manner of different things might give you a run of bad nights. Or periods in the night of hourly wakes - say 7pm to midnight - not great sleep habits but happens.
But NOT all night, every night, always. If that is happening, something needs change. It will indeed probably be due to waking fully in the 'environment check' between sleep cycles - a sign baby needs to go to sleep where they stay asleep. Not uncommon, still an unhealthy sleep habit and not 'to be expected' - it's as a result of poor slerp hygiene.
Imagine falling to sleep in your bed and rolling over an hour later and finding yourself in the back seat of a car. You'd wake up properly pretty darn quick, rather than rolling over and going straight back to sleep. That's the point of the environment check. It's why going to sleep in the cot is important.