you can use process builder to invoke approvals, and process builder has a next-gen time dependent workflow feature. So you create one stem with a current approval process and another with an auto approval with the time dependency built in. the trick will be to see what happens to the first approval when the second one fires
http://automationchampion.com/2014/06/27/auto-submit-record-into-approval-process-with-flow/
http://automationchampion.com/
So you create one stem with a current approval process and another with an auto approval with the time dependency built in.
the trick will be to see what happens to the first approval when the second one fires