一月（ひとつき）— one month (duration)
休み は 一月 だけ です。
The vacation is only one month long.
一月ひとつき
one month (duration)
ひとつき
accent [2]In detail
Words
休みyasumivacation
はwa(topic marker)
一月hitotsukione month
だけdakeonly
ですdesu(polite sentence ending)
Kanji
一イチ・
月ゲツ・
With the reading ひとつき, 一月 means a duration of one month. The same spelling read いちがつ means January.
Coco-sensei