I am a general contractor and subcontractor working with residential shower door glass and mirror installations, labor and material in Minnesota and Wisconsin. The first time we are at the residence is to measure the site of the work. We do not charge for this measure. We order the material for the job the day the customer or the general contractor give us the go ahead. We don't typically do the installation until 10 days later. What date should we pre-lien to start the clock in Minnesota and Wisconsin?