From memory, with an OM1, if you set it to 'B' and without a shutter release cable, you'll actually get about 3 or 4 seconds. Best way also is to set the self-timer and lock the mirror up to minimise vibration.
But without the release cable and limited to a few seconds, you won't get much unless to stick to lunar and planets etc. For those you use shutter speeds of 1/10 to 1/1000, depending on f-ratio etc. And for those you might as well use fine grain film, not 400 ASA.
But why not just get a release cable - they are only about $10 -$15 or so. Any decent camera shop should have one. Then you can do whatever long exposures you want.
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