長くもたない

won't last long

→ 長い
phrase Rare #38,526
won't last long Used to say that something will not continue, endure, or remain usable for much longer. Often used with そう or だろう to express a prediction.
JA: このスマホのバッテリーはもう長くもたない。
EN: This phone's battery won't last much longer.

そう長くもたない

It won’t last much longer.

— REC / レック (2007)

アルトゥーロ水がたまっている長くもたない

Arturo has fluid in his lungs. He won't last long.

— 雪山の絆 (2023)

私の貯金はとても少ないのであまり長くもたないだろう

I don't have much in savings, so it probably won't last very long.

長くもたない

It won't last long.

— 雪山の絆 (2023)