[lproven]

Laptop: rarely. My main travel one is a Thinkpad X220 I bought used for £150 in 2017. It replaced a Thinkpad X200 I bought used in 2013 for about the same price.

I recently (end of last year) bought i7 versions of the T420 and T520, because for me they are the last generation of Thinkpads with good keyboards, and I hope they will last me for a while.

My phone? It varies but typically every 18 months - 2 years. Phones lead hard lives and don't last very long.

Current: Umidigi F2. Before that: 2nd hand iPhone 6S+. Before that: PPTV King 7. Before that: Blackberry Passport (used). Before that: iRulu Victory V3. All those in the same time period that 2 old Thinkpads have covered, and all were relatively cheap.