On MT5, the time frame of a chart is shown at the top of the chart window. To check or change it:
Look at the toolbar above your chart — you’ll see buttons labeled M1, M5, M15, M30, H1, H4, D1, W1, MN. These are your time frames:
M1, M5, M15, M30 → Minutes
H1, H4 → Hours
D1 → Daily
W1 → Weekly...