Dear Vrushali,
Normally, the requirement of engaging employees on direct contract basis would arise only to fill the vacancy, if any caused by the sudden exit or substantially long leave by regular employee during which the post cannot be filled by another regular employee or in case of some adhoc or special or incidental nature of works to be accomplished within a particular time duration. Therefore, there is no necessity of granting any break artificially.
The services of clerks and sub-staff are quite essential and thus inevitable for the core activities of a bank. If you fill such vacancies with direct contract labor or outsourced indirect labor indefinitely, certainly such contracts become sham. Only then you rack up your brains to grant some periodical breaks so as to defeat any claim for regularisation later.
As these cadre of employees fall under the category of "workman" as defined u/s 2(s) of the Industrial Disputes Act, 1947 such an attempt by the bank would tantamount to unfair labor practice under the Act. Besides, how long such a preemptive break could be at the maximum in a period of 12 calendar months? Once such a direct contract employee completes 240 days of service in the preceding 12 months which includes holidays, authorised leave, any period of non-employment not due to the fault of the concerned employee, he is deemed to have completed a continuous service as per section 25-B of the IDA, 1947 and entitled to all the benefits on par with the regular employees doing the same or similar works.
Therefore, try to be fair with the contract, the employee and the law of the land.