Two years back I was doing six races a day plus practice, works out at very good value when you have travelled all the way to Pembrey or Darley Moor. Also gives you lots of track time and with the Open and the Streetstocks coming before the SoT races it made for extra practice. Helped me to 6th in the North Glos SoT championship that year with a best result of 3rd.
At my age it takes me most of the day to warm up and get on the pace