In my younger days I used to take holiday courses, esp at Bristol and Glos.
They were great, but as mentioned elsewhere, the sport is heavily weather- dependent and there were some courses where we had large amounts of flying andsome where we had very little.
For a PPL it will be a real eye-opener, and they may take longer to solo than they expect. The other issue that will come as an eye-opener will be the amount of time you will be expected to help other people - not something that happens much in the power world !!!
Just enjoy it