To make what I consider a halfway decent song with these current easiest-to-use services (like Suno and Udiio) takes a few hours in my experience. To get there one has to work with the text, the song structure, find a decent style, and then do corrections on sections where the models goes off track. To make something that is closer to "good", I would go and re-record all the lead vocals myself, and then mix this in a DAW.