SAR crews will normally carry out a training sortie twice per shift (SAR Missions notwithstanding). The shift will generally start around mid-day with an afternoon training sortie, stand-by overnight and a second training sortie before midday the following day, though it varies slightly from company to company. This is pretty much a rule of thumb and is dependant on many other variables. Weather, crew and/or aircraft hours (or lack of), techinical considerations etc. though crews are required to carry out a minimum number of hours in each discipline each year. Normal training sorties would generally be anything between 1 and 2 hours.