Beware that AT level is very special, and difficult to follow (for me).

"The computer will use half of the specified time to calculate the counter-move and use the remaining time to complete the search. The time varies in the opening game, the middle game and end game position accordingly. The
computer tends to play faster in the openings and endgame positions, but in complicated middle game positions it may take longer to make its move. Depending on the position the computer may take up to four times the set time on these levels." from Novag.

Best Regards,

mychess