I have been stuck on this because the Task system in Bushido is a fundimental part of the system but in d20 it a random hotch poch of ill tought out rules.
In Bushido it is simple, the amount you make your role is called the Effect Number.
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EF = Min(1, MCS - (Low)d20)
If roll is crit add 2d6 (IIRC)
Personally I have never like this so I have been experinmenting with removing the subtraction.
EF = (high)d20 iff roll <= MCS
if roll == MCS then crit, 20 always fail etc This has the advantage that on a success you never get a zero and have to worry about the min of 1.
When the total of the EF is greater than the Task Value the Task is done in that meant Task Turns.
d20
d20 system does not have a system per say, there is one on constructing items, you can also retry some skill until you make it, then there is the take 10 and 20 system.
The crafting objects skills work by having a DC which you have to beat normally 15 or 20. If the Roll * DC is greater or equal to the cost * 10 then the item is made. If it is not made then that is how much you have made of the time that week. If you fail by more than 5 the item is destroyed.
Check where there is no adverse effect you can just retry until you make it or use the take 10 or 20 system. This just assume that you take longer.
and is not a task system as such as there is no commutative value to record the progress of the task. It is either done it or not. So I suggest that we ignore this part of the the d20 system.