Glaze should not go before the sealant. A sealant will not bond to a glaze. The surface should oil and wax free before laying down a sealant.
Man, if it is taking you 23 hours to do a car then I sure hope you get paid by the hour to do that. I don't have many people willing to leave a car with me for three days while I detail it anyway. I try to avoid vehicles that are beat to hell and require that much time to make right. I haven't ever had a project that took me more than 15 hours to do, and that was a jet. I did a boat that took 12 hours once, but the longest I've ever spent on a single vehicle with wheels was 8 hours.
How much does one charge for a three day project? Maybe I should start stretching it out a little. lol