Daihatsu 1.0L 3-cyl. Yes 1.6L 4-cyl. Yes 1985-89 exc. Yes Porsche All 4-cyl. Or 72 months.
Some engines have two belts.
Or 144 months, whichever comes first. At high engine speed. Engine service schedule ends at 50,000 miles. Depending on cam position when the engine stops, the engine may escape damage, as opposed to most others, which are always damaged. Although some manufacturers do not specify a belt replacement, it's a good idea to plan for one at the 50 to 60 thousand mile mark.