your day rate plus 40% , is what I would go in at , its going to take just under aday, allowing for some bad bits , by the time you finish it you will be wanting to go home as your arms will be dropping off
allow for you to be working alittle slower the day after as again if it turns into a mare in places then your arms will still be hurting the day befoure ,
but if it goes well and it cleans off with no problems and you don't get arm and shoulder pain , then its a big pay day (we find doing these that it realy happens as there always a few small bits that takes more time to do then the rest )