In the "how to play" section, it says that the number of troops you recieve is multiplied by the number of days since your last turn. i'm currently in a game in which my three opponents have for some reason decided not to play, so it has been three days since my last turn, but the number of troops i recieved was not multiplied, i only got 3.
It is only multiplied by days in a freestyle game, in which the players have 24 hours to complete their moves each round.
In a sequential game, each player has 24 hours to complete his/her turn. In this way you can go a few days in a sequential game before it is your turn again, and still not miss a go/get extra troops.
""days since last turn" is the number of days since your last turn"
Well, thats what it says in the how to play section. I suppose its just a little misleading.