That depends! If you have bonds in WPC II, your bonds will have a lifespan of 36 months. Once a bond reaches its maturity date of 36 months from initial investment, it will be redeemed and the money will automatically be sent back to the bank account you have linked with Worthy. If all of your bonds for WPC II mature, the remaining principal ($10 per bond owned) and all remaining interest earned will be redeemed to your linked banked account.
The bonds sold in WPB and WCB have no maturity date so you can keep earning for as long as you wish without having worry about a maturity date.
Please note that since bonds in WPC II, WCB and WPB are liquid, you can withdraw them whenever you wish! (But who’d want to do that and miss out on all that interest?!)