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Wow ! This is an interesting question, probably asked by every fresher coming out of college. To work abroad is a dream for many freshers, but companies like TCS do not have anything in CTC or contract with their employees to send them abroad.
Well the time depends on business requirements, employee's ability and circumstances. Nowadays due to huge number of employees aspiring to go abroad, companies have few criteria to send an employee abroad. Major criteria are number of years employee worked for the company, contributions towards account/business unit. Usually general thumb rule for an employee to work at least 3 years in same company before a supervisor or HR entertains a request like this.