You cam check in game. Dont know how it is called in english, but you can go to your profile and tab with events, it also displays stuff like pages of history etc. Just go to call of the dragon event, and you can display progress bar per daily star. Modifiers are written under it.
Rank III has 0.8x, rank IV has 0.9x etc.
0.8x for arcade.
If you want to calculate how score you get the event, take your mission score, multiply that by the game mode modifier, AND THEN you multiply it by rank modifier. Modifiers arent applied at once.
You can check the tables i attached in the OP. I plan to add more later, as it seems that people got tired of arguing and those who remain geniunely want to put something together.
For example here, data i collected in the ground realistic 5.7 US session.
You can go and check what vehicles and crews i used in original post.
It took me 17 games with average score of 2185 BEFORE multipliers.
Each game, counted from moment i start loading into the game to the moment i started loading back to the menu, was on average 12 mimutes 3 secs.
It tool me 3 hours 37 minutes of playing (ie. being loaded into the game) to reach 45k score.
4 hours 18 minutes if i include time between each game.
But do note that there are multple things it DOESNT take into account or problems (low sample size, or in case of the realistic US 5.7 session, it could be theoretically shorter because I needed to only gain some 500 score, etc.) which were discussed in this topic (ie. Either Ignore insults, and go through the comments to know what i am talking about, or look at this table with grain of salt).
In the end i do hope that by the end of the event we will have larger sample size and across both arcade and realistic modes, and across all ranks, so there can be some easy comparation.
Also do note that another player took larger sample size and made graphs etc. In the other thread, but while that is extremely useful, it only tells you what average player is. I hope that in the end this post will complement his data as individual examples, so people can make clearer picture on the whole situation.