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かかるだろう

will probably take

→ 掛かる
phrase Uncommon #8,433
will probably take Used mainly with amounts of time or money to say that something will probably require that much. だろう adds an element of probability.
JA: この仕事を終えるには三日かかるだろう。
EN: This work will probably take three days.

このプロジェクトを終えるのに最低でも一年はかかるだろう。

It will take at least a year to complete this project.

彼がよくなるにはしばらくかかるだろう。

It will probably take him a while to get better.