時間がかかるだろう

will probably take time

→ 時間
phrase Uncommon #14,815
will probably take time Used to say that something will likely require time. 長い時間がかかるだろう means “will probably take a long time.” だろう expresses probability or an educated guess.
JA: 彼女が父親の死の悲しみから立ち直るには長い時間がかかるだろう。
EN: It will probably take her a long time to recover from the grief of her father's death.

その話を全部話すには時間がかかるだろう

It would take time to tell the whole story.

その川を泳いで渡るとしたらどれだけ時間がかかるだろう

I wonder how long it would take to swim across that river.

経済不振抜け出すには時間がかかるだろう

It will probably take time for the economy to recover from its current slump.

その国民主的考えを導入するには時間がかかるだろう

It will probably take time to introduce democratic ideas into that country.

彼がすっかり回復するまでにはだいぶ時間がかかるだろう

It will probably take quite a while for him to make a full recovery.

彼がそのことを理解するにはしばらく時間がかかるだろう

It will take him some time to understand that.

この宿題はだいぶ時間がかかるだろう

This homework will probably take quite a while.