Early Google varied a lot. There were a lot of fires in those days that required long hours by engineers. Jeff Dean received a little statue IIRC for taking part in the "index wars", where due to a pervasive lack of checkpointing in the indexing pipeline they had been unable to push a new index to prod for months. And Lucas Pereira regularly had to ship new indexes to the east coast by loading them into his car then driving across the USA.
It's also easy to forget that Google established product-market fit in an uncompetitive market immediately, then found a cash geyser business model only about six months later (or rather copied it from Inktomi). They didn't need to work crazy hours because web search was viewed as a dead end problem that didn't make money, so nobody was chasing their tail. Google's early culture of strict secrecy was a direct consequence of this strange birth: if anyone had found out earlier how much demand existed for AdWords they'd have faced much harsher competition much faster. But Google swore everyone to absolute secrecy, and so the first time the industry discovered how valuable search is was in 2004 on the day of the Google IPO. By then Google had invested so much in R&D that it was impossible to catch up.
Very few companies can be compared to early Google, unfortunately.