That's a setting for how many completed tasks to synchronize. This can significantly affect sync times—e.g. syncing all completed tasks for your account that's been opened for years can take some time!—so we offer an option. The question ultimately comes down to how often you need to have access to your completed tasks (and how many of them) from your iPhone.

So how does one find this setting? Is it found here on the desk top or the iPhone? I'll go look... but I don't recall seeing that option! Thanks!

Vonnie40,

Go to the iPhone app, tap more (bottom right corner), choose settings and then in settings scroll down to Sync, tap sync and choose the sync history you want.

I hope this helps,
Leah