Take clock
Set time ALWAYS FIRE to FALSE
set clock TIMER ENABLE to FALSE
set the block
WHEN BUTTON1 CLICK >
SET BUTTON1 ENABLE TO = FALSE
SET CLOCK TIMER ENABLE = TRUE
Set block
WHEN CLOCK TIMER DO
SET GlobalClock TO > 0 (you must take variable)
SET GlobalClock TO > (tag)GlobalClock + 1
SET LABEL TEXT TO = (tag)GlobalClock
IF GlobalClock(tag) = 60 (in second it is 1 minute, set as you like)
SET BUTTON1 ENABLE TO = TRUE
SET GlobalClock TO 0