My rototillers just went out and I have a mantis 2 stroke I just got. The job is 600 sq ft and need ammendments tilled in. The home owner is soaking it down for 30 mins today and Im doing the job saturday. Will the mantis help me till in the topsoil/compost good? Never used one for a job like this. Also how long do you guys think it will take me with this tiny tiller.