Approval tables for Vouchers

Hello,

I am looking at different tables to see if I can use any one of the tables to check the no. of days elapsed after a voucher is submitted for approval. Basically, I need to use this as a criteria to look up vouchers where a certain number of days have elapsed after the voucher is submitted for approval.

We have multiple approvers each defined at specific steps and the objective is to check whether a voucher pending at a particular step( approver) has elapsed the required number of days. Which table would give that information ?

Thanks,

Debolina