Don't think any Antara has a warning light to tell you that a regen is taking place, just when you have ignored/interrupted them. The fuel consumption drops dramatically when a regen happens but as far as I know if you interrupt one the mpg returns to normal until it decides to start again. As to how long to "drive through it" I find usually about 20 miles reinstates the magic 999. At the end of the day mine just appears to get on with it.
Antara SE 184 AWD Man. Placid Grey/Black..... now tows a Compass Rallye 574