I am new to EK. My second trip of the year. I was able to upgrade both ways IAH-DXB-IAH from Biz to F on my last trip. Now trying to do the same for my flight this week.

On my upcoming trip, the F cabin is showing F4 on ExpertFlyer (I think thats the max EF ever shows for EK space -- cant seem to find any flight over F4).

Is there any certain number of upgrades that EK allows and then doesnt allow anymore? Certain number of days out, etc?

I know the upgrade routine with LH and UA. Just curious if EK has a certain method on releasing the upgrade space.

thanks!