Have you used LastPass? LastPass has several options to not re-enter a master password if you choose:
1) If you have an iPhone you can unlock the vault with TouchID 2) Create a 4 character pin
Both of these are enabled after x minutes that you set post entering your master password. Between having a passcode/touchID to unlock the iphone, having to enter last pass master password, and then having a secure pin post master password I feel it is secure enough for my needs.