While calculating holding levels, work-in-process in calculated in terms of months of _?

Create a team building activity that includes fun interacting between the team, role play there is much more you can do when you think outside the box, you can also have a small team lunch where it make team members feel more relax and open to question or suggestion, have these activities not in work place but in a different environment.

it is deppended time of tripping-rate of peneteratin-rate per minute driling-cost of rig  and cost of bit.

I agree with Mr. Malik answer

Work in progress in always calculated on the %age of completion, it cannot be associated with time.  Holding level is in terms of construction, loans are granted on some critieria, for example,40% on Base level, the2nd instalment will be on hold, unless the base is completed,20% on Walls before the construction of Roof and like that.

Cost of production