That depends! If you have bonds in WPC or WPC II as you near 36 months, you will be given a chance to renew your bonds for the same 5% annual interest rate. You can either renew them - or a portion of them - or you can cash them in and the money (principal and interest) will be sent back to the bank you have linked to your Worthy account.
The bonds sold in WCB have no maturity date so you can keep earning for as long as you wish without having to renew the bonds.
Please note since bonds in WPC, WCP II &WCB are liquid so you can withdraw them whenever you wish! (But who’d want to do that and miss out on all that interest?!)