为限

为限 [wéi xiàn]

1. ■ be within the limit of; not exceed; be good for ... only:

有效期以1个月为限 be effective within the limit of a month; be good for one month only;

载重以5吨为限。 The load should be no more than five tons.

费用以200元为限。 The expenses shall not exceed 200 yuan.