A critical component for a mechanical system will be subjected to a 0.01 Hz cyclical stress during operation (0.01 cycles per second). The stress will fluctuate between a tensile load of 150 MPa and a compressive load of -250 MPa. The design calls for a survival confidence limit of 10% (i. e. 10% failure rate acceptable). Approximately how long, in days, can the component be used before it must be replaced during maintenance