As others have posted before here is a spreadsheet with the cost/exp of ploughing factored in, sorted asc by time.
Crop Profitability (Including ploughing)
https://spreadsheets.google.com/pub?k...=0&output=html
The min/max plant order I would use would be Strawberries(5min) -> Grapes(8h)/Lemon Cucumber(16h) -> Cabbage(6h)/Black Currant(4h)/Broccoli(8h). If you are going to be away for 24h+, I would stick to Soy Bean(24h) -> Spinach(48h). Like the OP mentioned, I would stick to the most profitable crop that fits into your time schedule.