How long payroll takes to process your Payslips it will depends on your payroll method as its calculated manually or automatically. Payslips generate with Automatic payroll will takes around 1-2 Working days and also its depends on how many employees you had. Once Payslips generated with Payroll software they automatically submitted to bank and wages or salary will be credits to the employee account in next 2-3 working days.
Employer need to Generate payslips on their schedule time as per the rule. If you runs small or medium organization then you can Generate or order Payslips online though UK's top Payroll Portal at very lowest cost it will save your in house payroll expense.