u/Pretty-Way-7093

I'm planning in adding Swimming to my weekly exercise routine. For context, I run twice a week (5km easy and 10km+ long run), I also do 10k steps for 5 days when I'm not running, 2 days for strength straining and 1 day for Pilates.

How long should I swim for or what would be the ideal lap to do for starters? I enjoy doing freestyle and backstrokes.