Antaiji was also 4am to 9pm straight 50 minute Zazen (except for meals) ...
http://antaiji.org/en/practice/schedule/#tab2
... other days, hard physical labor in the farm fields and cutting trees, too. Yes Kakunen?
Basically, a "monastery" is a boot camp for the training of young monks, usually for a year or two before they return to their family temples (the temples where their father is the head priest). Antaiji is a bit different, as it is more centered on foreigners and Japanese who are interested in Zazen, and is not such a training monastery.
A "temple" is now usually inherited from father to son, and is mostly concerned with performing funeral and ancestor commemoration rites for neighborhood parishioners. Only a minority of temples might have a sometime Zazen group. The temple that Kakunen mentioned, Jyomanji, is a bit different as it is trying to be more international, and has more of an active Zazen focus. There are a few others like that.
A "Zen Center" is really an idea from America, which is a place centered primarily on Zazen and lay practice. I consider Treeleaf a Zen Center. Some, like Tassajara at San Francisco Zen Center, may have more of a monastic atmosphere, although usually not as strict as the Japanese boot camp.
Gassho, Jundo
SatTodayLAH