いっきかせい
finishing writing, work, etc. at a stroke (stretch); knocking something off without a break
Also written 一気かせい
Adverb, Noun
彼かれ、一気呵成いっきかせいに書かき上あげたと言いってたけど、この提案書ていあんしょ、少すこし雑ざつだね。
He said he dashed this proposal off in one sitting. It's pretty sloppy.