ZURICH—Credit Suisse will extend time off for childcare and holidays and will let senior managers take sabbaticals under new rules for Swiss staff to take effect next year, Switzerland’s second-biggest bank said on Monday. “Helping parents with childcare and encouraging staff to regularly take time off to rest are a priority for Credit Suisse,” it said in a statement, citing increasingly diverse family configurations and the need for regular breaks from work. The move comes as banks consider whether traditional working conditions are still relevant as they look to attract a more diverse workforce. Maternity or adoption leave for the primary caregiver will be 26 weeks, while paternity or adoption leave for the secondary caregiver will increase to six weeks from 12 days currently. If both parents work at Credit Suisse, they can split 10 weeks of parental leave as they choose after the 16th week of maternity leave, or …