I hope you enjoy 1.8 and everything which follows in the year ahead.
Per image I spend on average about 30 minutes getting the prompts (Prompts/Negatives) and configuration (Model/Refine/Sampler/Steps/Scale) right
Then another 30 minutes post editing in Photoshop (Lines/Details/Colours/Saturation/Filters)
Then about 20 minutes in Grok Imagine getting the animation prompts right
All time spend depends on the image however. It is best to start off with a clear vision of what you want. As with anything in life the more time you spend practising the better you will get. The best thing you can do it try everything, do not be afraid of making mistakes and set yourself a goal and routine.