你们既然没合同，那肯定没租约时间了。periodic agreement （no ground）得必须给足90天外加4天邮寄信件得时间。。。要是有规定日期，无理由叫人搬走得话，那就至少30天＋4天。
The bond is money you pay at the start of the tenancy as a security in case you do not follow the terms of the residential tenancy agreement.
bond金只是防止房客违约得，和你给notice没关系。