Different ways to say "at least" / 「少なくとも」


I would like to know if there are other ways to say "at least~" (context
below), along with the relevant nuances of each way.

This is for a piece of writing I'm doing where for the sake of style I want to
avoid using the same phrase too many times. That said, please do include
answers that may only be suitable for speech or conversation.

I am referring to "at least~" as used in the following context:

> It looks like I won't be able to return to Japan for **at least** 6 months  
>  **少なくとも** ６ヶ月の間日本に帰れないみたいです。

(in other words I'm not looking for answers referring to phrases like せめて〜,
which translates to a different meaning of the English phrase "at least")




  * 最短で "for the shortest"
  * 少なく見積もって "under the least/shortest estimate"
  * は as in 六か月は




  * 最短で "for the shortest"
  * 少なく見積もって "under the least/shortest estimate"
  * は as in 六か月は

