question regarding backup and restore (Lev 0,1 and archive)

Does Level 0 include archivelogs without adding plus archivelog in backup command.

lev 0 at 2am

example If run archivelogs every 1 hour, starting 3am

incremental backups every 4 hrs starting 7am

if incremental backups are not available bcoz of some issue which we notice at 6pm till what time can we restore.

My assumption is we can restore till 6pm as we took archivelog backups every hour so we can do lev 9 restore and recover db using archive logs till last archive logs which is at 6pm.

let me know if anything different than this.