Why is extract takeing too long for a check point to apply

Why is my time since chkpt value keep increasing. Any help.

Program     Status      Group       Lag at Chkpt  Time Since Chkpt

MANAGER     RUNNING

EXTRACT     RUNNING     DP_P200     00:00:00      22:02:33

EXTRACT     RUNNING     DP_P300     00:00:00      25:58:28

EXTRACT     RUNNING     DP_P400     00:00:00      00:00:03

EXTRACT     RUNNING     DP_P500     00:00:00      00:00:03

EXTRACT     RUNNING     DP_P600     00:00:34      00:00:09

EXTRACT     RUNNING     EXT_P200    19:53:22      22:02:34

EXTRACT     RUNNING     EXT_P300    00:00:03      25:58:32

EXTRACT     RUNNING     EXT_P400    00:00:54      00:00:04

EXTRACT     RUNNING     EXT_P500    00:00:50      00:00:06

EXTRACT     RUNNING     EXT_P600    00:00:57      00:00:06

REPLICAT    RUNNING     REP_1000    00:00:00      00:00:07

My source DB is a warehouse and also target for GG, GG version is 12.2, DB is 12.1