In this case, swapping may indeed occur more often, especially when we run memory-intensive applications. Things are different on a system where RAM is sparse and cannot be upgraded. However, having this mostly-unused swap partition on a conventional hard drive will not lead to any performance drop, so we can safely put our swap partition (or file) on that significantly cheaper hard drive and use the space on our SSD for something more useful. In this case, the wearing of a SSD from swapping will not be an issue. It is merely a safety measure to prevent data loss in case an application ate up all our RAM. On a system with plenty of RAM and few memory consuming applications we will almost never swap. Having said that, both the lifespan and the use of a SSD for swapping depends on several factors.
Modern SSDs can score as low as 20 TB for a consumer product but can score over 20,000 TB in an enterprise-level SSD. A widely available value for endurance is TBW ( Tera Bytes Written, or alternatively total bytes written) which is the amount of bytes writeable before the drive fails. To have a value we can use to compare the endurance of a SSD, we can use lifespan measures such as the JEDEC published standards. In most drives, unused areas will also be available to backup damaged cells and to delay aging. Additionally, the SSD intelligent firmware will ensure evenly distributed erasures between all the cells. The amount of erase cycles a cell can survive is highly variable, and flash from modern SSDs will survive many more than flash from SSDs made several years ago. Every write (but not read) cycle (or more accurately every erasure) wears a memory cell, and at some point it will stop working. Flash RAM cells in SSDs have a limited lifespan.
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