Removing Mastic foster

[Aourhebal]

Hi

Can you anyone help me?? i would like to know how much time it takes to remove a Faster mastic from a tank and put a new one
Tank details:

Height : 25 m
Diameter : 35 m

 

[Ron]

Ask a local contractor

 

[Aourhebal]

I'm suppose to estimate the duration of this task and ask the contractor to respect that duration
I was wondering if you have a document or somethings talks about this.