The speaker predicts that the remaining renovation work will be completed within a total cost of $3500 (assuming '35 months' is a typo for '$3500' given the context of the previous cost). Alternatively, if 'months' is correct, it suggests a very long timeline, but given the context of completing work, a monetary value is more likely.
"I should be able get the rest of this work done for a total of 35 months"