I am just starting out in landscaping and I have a job that I am trying to calculate roughly how long it will take me. The space is a front yard 20' x40'. I have to spray to kill some sparse grass and weeds. Then lay down thick fabric to keep any new weeds from coming up through the rocks. I will need to put a border a border along one 20' side and one 40' side to contain the lava rock. I am just doing the labor. All materials will be dropped off for me in the front yard. Any ideas on roughly how long this should take? I would think maybe 10 hours for the job but as I am pretty new I don't want to guess to low or high. I tend to think jobs won't take nearly as long as they take me right now. Maybe a break down of how long each step would take. Any thoughts are greatly appreciated.