[tlhIngan Hol] Expressing "one and a half year ago"

[mayqel qunenoS]

Recently, the need came up to express "one and a half year ago".

Perhaps, the "safest" way to go, would be {wa'maH chorgh wen} "18 months ago".

But I'm wondering whether it would be acceptable as well to say, {wa'
wa' bID je ben} for "one and a half year ago", or maybe even {wa' vI'
vagh ben} for "1.5 years ago".

~ mayqel *I love maltz* qunen'oS