Number of times can be programmed (erase/write) altera chips

The question makes only sense for flash based programmable logic devices, e.g. various MAX types and configuration flash memory, not for FPGA with external configuration memory.

Modern MAX10 devices are e.g. specified with 10000 erase and reprogram cycles, which is surely sufficient for configuration memory and most user flash memory applications. But it suggests to avoid permanent rewriting of user flash content.