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(Moved from main page in order to discuss)
Harleqin: Is this a good place for this? Should it perhaps go to a new page "how to use Fischer time"?
Here is a rule of thumb for converting from a canadian overtime setting to a Fischer setting (Fi is Fischer initial time, Fb is Fischer bonus time, Cm is Canadian main time, Cs is Canadian moves per period, Cp is Canadian period length):
Example: Canadian 60 min & 15 moves/5 min converts to Fischer 30 min + 20 sec/move
Canadian 60 min & 15 moves/5 min converts to Fischer 30 min + 20 sec/move
This sounds reasonable. 5 min/15 moves = 20 sec/move. If the first 90 moves (to move 180) are played at 40 sec/move, the 60 minutes is used in Canadian byo-yomi, and the 30 minutes are used in Fischer timing.
That suggests this rule of thumb: Convert Canadian overtime to sec/move = Fb. Then
Fi = Cm - 3*Fb/2
Fi in minutes, Fb in seconds.
In this case Fb = 20, and Fi = 60 - 3*20/2 = 60 - 30 = 30.
As a rule of thumb it seems OK. The problem always remains with main plus Canadian that you can not judge the total time well because in any game you will be uncertain when each player will use up their main time and enter the Canadian phase. The formula works well when the players use the main time for about 100 plays. Fewer plays (slower thinking in main time) will result in more time being delivered than the 30/20 Fischer while more plays (faster thinking) will result in less time delivered.