The Army Reserve works on one weekend per month and then trains for an additional two weeks per year. This means that each month you will attend a monthly Battle Assembly (also called a “drill”) and once per year, you will be asked to attend two weeks of training as a unit.
Occasionally, there will be a longer (3 or 4 days) Battle Assembly to complete more complex training tasks, but these will be announced well in advance. In addition to the one weekend a month and two weeks a year, 38G recruits that are not already commissioned Officers will be required to attend some mandatory training courses in the first 24 months of their commission.