How often does a Reservist have to attend training?

Although an individual's training liability varies between the different elements of the Reserve Forces, for most Reservists the liability is made up of three forms of training: weekly training, which normally takes place in the evening and lasts about two-and-a-half hours; weekend training, which is occasional and spread throughout the year; and a continuous training period, which takes place once a year and generally lasts for 15 days.