How to use the online timer
Half an hour at the kit is physically demanding in a way most instruments are not, and technique degrades with fatigue faster than on anything else, so a focused thirty minutes beats an hour that ends with sloppy limbs. It also has to fit around the neighbours, which is why a practice pad does much of the work: rudiments, stick control and hand speed all improve on a pad and nobody two doors down has an opinion about it.
Time is the job. A drummer with modest technique and dependable time is more use to a band than a spectacular one who rushes the fills, so a real chunk of the session belongs to a metronome, played with rather than against. Start slower than feels necessary and only move the tempo up when the click disappears underneath what you are playing rather than fighting it.
Rudiments earn their place even after years: singles, doubles and paradiddles, slowly, then faster, then slowly again. Limb independence is better taken apart rather than attacked whole, adding one limb at a time to a groove until all four cooperate. A fill that keeps falling over should be practised at half speed until it is clean, since playing it at full speed and crashing through the ending simply teaches the crash.
Common questions
How can I practise without annoying the neighbours?
A practice pad covers rudiments, stick control and hand speed, which is a large part of drum technique. Kit time can then be saved for when noise is less of a problem.
Why is timing more important than technique?
Because a band needs the drummer to hold the tempo. Dependable time with modest technique is more use than spectacular fills that rush, which is why the metronome deserves a real share of the session.